Add Data settings page and storage scanner

Introduce a new "Data" settings page to visualize and manage local app storage. Adds DataStorageService (scanning, disk info, clean operations), DataSettingsPageViewModel, XAML view and code-behind, and HexToColor/HexToBrush converters; registers converters in App.axaml. Also update localization strings for the new page and add icon mapping so the settings entry uses the Database icon. Enables per-category and global cleaning workflows and formatted size display.

.trae/specs/data-settings-page/design.md

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+# 数据设置页设计文档
+
+## 概述
+
+在设置窗口中新增「数据」设置页，用于可视化展示和管理阑山桌面产生的各类本地数据。采用 Fluent Design 风格的横向堆叠条形图展示存储分布。
+
+## 设计目标
+
+1. 让用户直观了解阑山桌面占用的存储空间
+2. 提供各类数据的占比可视化
+3. 支持按类别清理数据
+4. 显示相对于磁盘总容量的占比
+
+## 页面结构
+
+### 存储概览区域
+
+顶部一个卡片，包含：
+- **横向堆叠条形图** — 各类数据用不同颜色的分段表示
+- **总占用大小** — 阑山桌面数据总大小（如 "1.2 GB"）
+- **磁盘占比** — 占总磁盘空间的百分比（如 "占 C 盘 0.5%"）
+- **图例** — 各颜色对应的数据类型
+
+### 数据类型详情列表
+
+下方列表展示每类数据：
+- 图标 + 名称
+- 占用大小
+- 描述/路径提示
+- 「清理」按钮（如适用）
+
+### 操作按钮
+
+- 「刷新」— 重新扫描数据大小
+- 「一键清理」— 清理所有可清理的数据
+
+## 数据类型
+
+| 类型 | 颜色 | 可清理 | 路径 |
+|------|------|--------|------|
+| 日志文件 | 灰色 | 是 | `log/` |
+| 白板笔记 | 橙色 | 是（过期） | `Whiteboards/` |
+| 插件数据 | 蓝色 | 是 | `Extensions/Plugins/` |
+| 插件市场缓存 | 紫色 | 是 | `PluginMarket/` |
+| 壁纸文件 | 粉色 | 是 | `Wallpapers/` |
+| 设置文件 | 绿色 | 否 | `settings.json` |
+
+## 技术实现
+
+### 新增文件
+
+- `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml` — 页面视图
+- `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml.cs` — 页面代码隐藏
+- `LanMountainDesktop/ViewModels/DataSettingsPageViewModel.cs` — 视图模型
+- `LanMountainDesktop/Services/DataStorageService.cs` — 数据扫描服务
+
+### 修改文件
+
+- `LanMountainDesktop/Views/SettingsWindow.axaml.cs` — 图标映射（MapIcon）添加 Database 图标
+
+### 设置页注册
+
+```csharp
+[SettingsPageInfo(
+    "data",
+    "Data",
+    SettingsPageCategory.General,
+    IconKey = "Database",
+    SortOrder = 5,
+    TitleLocalizationKey = "settings.data.title",
+    DescriptionLocalizationKey = "settings.data.description")]
+```
+
+## 视觉设计
+
+### 堆叠条形图
+
+- 高度：24-32dp
+- 圆角：使用 `DesignCornerRadiusSm`
+- 分段间距：2dp
+- 未占用空间：透明或浅色背景
+
+### 颜色方案
+
+使用 Material Design 颜色，与主题协调：
+- 日志：Gray / BlueGray
+- 白板：Orange / Amber
+- 插件：Blue / Indigo
+- 缓存：Purple / DeepPurple
+- 壁纸：Pink
+- 设置：Green / Teal
+
+## 交互行为
+
+1. 页面加载时自动扫描数据大小（异步）
+2. 显示加载指示器
+3. 清理操作需要确认对话框
+4. 清理完成后自动刷新数据
+
+## 安全考虑
+
+- 清理前确认用户意图
+- 设置文件不可清理（防止误删配置）
+- 清理操作记录日志

.trae/specs/data-settings-page/plan.md

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+# 数据设置页实现计划
+
+> **Goal:** 在设置窗口中新增「数据」设置页，可视化展示阑山桌面各类本地数据的存储占用，支持数据清理。
+
+> **Architecture:** 采用 MVVM 模式，新增 DataStorageService 负责异步扫描各类数据大小，DataSettingsPage 使用 Fluent Design 横向堆叠条形图展示存储分布。
+
+> **Tech Stack:** Avalonia UI, FluentAvaloniaUI, CommunityToolkit.Mvvm, C# 13
+
+---
+
+## 文件结构
+
+| 文件 | 职责 |
+|------|------|
+| `LanMountainDesktop/Services/DataStorageService.cs` | 扫描各类数据目录大小，计算磁盘总容量 |
+| `LanMountainDesktop/ViewModels/DataSettingsPageViewModel.cs` | 数据设置页视图模型，绑定存储数据和清理命令 |
+| `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml` | 数据设置页 XAML 视图（堆叠条形图 + 列表） |
+| `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml.cs` | 页面代码隐藏，注册设置页属性 |
+| `LanMountainDesktop/Views/SettingsWindow.axaml.cs` | 修改图标映射，添加 Database 图标 |
+
+---
+
+## Task 1: 创建 DataStorageService
+
+**Files:**
+- Create: `LanMountainDesktop/Services/DataStorageService.cs`
+
+**职责：** 扫描阑山桌面各类数据的存储占用，计算磁盘总容量。
+
+- [ ] **Step 1: 创建 DataStorageService**
+
+```csharp
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+public sealed record StorageCategoryInfo(
+    string Id,
+    string Name,
+    string Description,
+    string DirectoryPath,
+    bool IsCleanable,
+    string ColorHex);
+
+public sealed record StorageScanResult(
+    StorageCategoryInfo Category,
+    long SizeBytes,
+    double PercentageOfTotal);
+
+public sealed class DataStorageService
+{
+    private static readonly IReadOnlyList<StorageCategoryInfo> Categories = new List<StorageCategoryInfo>
+    {
+        new("logs", "日志文件", "应用运行日志", "", true, "#9E9E9E"),
+        new("whiteboards", "白板笔记", "桌面白板笔记数据", "", true, "#FF9800"),
+        new("plugins", "插件数据", "已安装插件文件", "", true, "#2196F3"),
+        new("market", "插件市场缓存", "插件市场元数据缓存", "", true, "#9C27B0"),
+        new("wallpapers", "壁纸文件", "下载的壁纸资源", "", true, "#E91E63"),
+        new("settings", "设置文件", "应用配置数据", "", false, "#4CAF50")
+    };
+
+    public IReadOnlyList<StorageCategoryInfo> GetCategories() => Categories;
+
+    public async Task<IReadOnlyList<StorageScanResult>> ScanAsync(CancellationToken cancellationToken = default)
+    {
+        var results = new List<StorageScanResult>();
+        var dataRoot = AppDataPathProvider.GetDataRoot();
+        var logDirectory = AppLogger.LogDirectory;
+
+        long totalSize = 0;
+        var categorySizes = new Dictionary<string, long>();
+
+        foreach (var category in Categories)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            string path = category.Id switch
+            {
+                "logs" => logDirectory,
+                "settings" => dataRoot,
+                _ => Path.Combine(dataRoot, category.DirectoryPath)
+            };
+
+            long size = 0;
+            if (category.Id == "settings")
+            {
+                size = await GetSettingsSizeAsync(dataRoot, cancellationToken);
+            }
+            else if (Directory.Exists(path))
+            {
+                size = await GetDirectorySizeAsync(path, cancellationToken);
+            }
+
+            categorySizes[category.Id] = size;
+            totalSize += size;
+        }
+
+        foreach (var category in Categories)
+        {
+            var size = categorySizes.GetValueOrDefault(category.Id, 0);
+            var percentage = totalSize > 0 ? (double)size / totalSize * 100 : 0;
+            results.Add(new StorageScanResult(category, size, percentage));
+        }
+
+        return results;
+    }
+
+    public async Task<long> GetTotalDiskSpaceAsync(CancellationToken cancellationToken = default)
+    {
+        return await Task.Run(() =>
+        {
+            var dataRoot = AppDataPathProvider.GetDataRoot();
+            var driveInfo = new DriveInfo(Path.GetPathRoot(dataRoot) ?? dataRoot);
+            return driveInfo.TotalSize;
+        }, cancellationToken);
+    }
+
+    public async Task<long> GetAvailableDiskSpaceAsync(CancellationToken cancellationToken = default)
+    {
+        return await Task.Run(() =>
+        {
+            var dataRoot = AppDataPathProvider.GetDataRoot();
+            var driveInfo = new DriveInfo(Path.GetPathRoot(dataRoot) ?? dataRoot);
+            return driveInfo.AvailableFreeSpace;
+        }, cancellationToken);
+    }
+
+    public async Task<bool> CleanCategoryAsync(string categoryId, CancellationToken cancellationToken = default)
+    {
+        var category = Categories.FirstOrDefault(c =>
+            string.Equals(c.Id, categoryId, StringComparison.OrdinalIgnoreCase));
+
+        if (category is null || !category.IsCleanable)
+        {
+            return false;
+        }
+
+        var dataRoot = AppDataPathProvider.GetDataRoot();
+        string path = categoryId switch
+        {
+            "logs" => AppLogger.LogDirectory,
+            _ => Path.Combine(dataRoot, category.DirectoryPath)
+        };
+
+        if (!Directory.Exists(path))
+        {
+            return false;
+        }
+
+        return await Task.Run(() =>
+        {
+            try
+            {
+                if (categoryId == "logs")
+                {
+                    foreach (var file in Directory.GetFiles(path, "*.log"))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteFile(file);
+                    }
+                }
+                else
+                {
+                    foreach (var file in Directory.GetFiles(path, "*", SearchOption.AllDirectories))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteFile(file);
+                    }
+
+                    foreach (var dir in Directory.GetDirectories(path, "*", SearchOption.AllDirectories)
+                        .OrderByDescending(d => d.Length))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteDirectory(dir);
+                    }
+                }
+
+                AppLogger.Info("DataStorage", $"Cleaned category '{categoryId}' at '{path}'.");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DataStorage", $"Failed to clean category '{categoryId}'.", ex);
+                return false;
+            }
+        }, cancellationToken);
+    }
+
+    private static async Task<long> GetDirectorySizeAsync(string path, CancellationToken cancellationToken)
+    {
+        return await Task.Run(() =>
+        {
+            long size = 0;
+            try
+            {
+                foreach (var file in Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories))
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+                    try
+                    {
+                        var info = new FileInfo(file);
+                        if (info.Exists)
+                        {
+                            size += info.Length;
+                        }
+                    }
+                    catch
+                    {
+                        // Ignore files we can't access
+                    }
+                }
+            }
+            catch
+            {
+                // Ignore directories we can't access
+            }
+
+            return size;
+        }, cancellationToken);
+    }
+
+    private static async Task<long> GetSettingsSizeAsync(string dataRoot, CancellationToken cancellationToken)
+    {
+        return await Task.Run(() =>
+        {
+            long size = 0;
+            var settingFiles = new[] { "settings.json", "plugin-settings.json", "launcher-settings.json" };
+            foreach (var file in settingFiles)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                var path = Path.Combine(dataRoot, file);
+                if (File.Exists(path))
+                {
+                    try
+                    {
+                        size += new FileInfo(path).Length;
+                    }
+                    catch
+                    {
+                        // Ignore
+                    }
+                }
+            }
+
+            return size;
+        }, cancellationToken);
+    }
+
+    private static void TryDeleteFile(string path)
+    {
+        try
+        {
+            File.SetAttributes(path, FileAttributes.Normal);
+            File.Delete(path);
+        }
+        catch
+        {
+            // Ignore deletion failures
+        }
+    }
+
+    private static void TryDeleteDirectory(string path)
+    {
+        try
+        {
+            Directory.Delete(path, false);
+        }
+        catch
+        {
+            // Ignore deletion failures
+        }
+    }
+
+    public static string FormatBytes(long bytes)
+    {
+        const long KB = 1024;
+        const long MB = KB * 1024;
+        const long GB = MB * 1024;
+        const long TB = GB * 1024;
+
+        return bytes switch
+        {
+            >= TB => $"{bytes / (double)TB:F2} TB",
+            >= GB => $"{bytes / (double)GB:F2} GB",
+            >= MB => $"{bytes / (double)MB:F2} MB",
+            >= KB => $"{bytes / (double)KB:F2} KB",
+            _ => $"{bytes} B"
+        };
+    }
+}
+```
+
+---
+
+## Task 2: 创建 DataSettingsPageViewModel
+
+**Files:**
+- Create: `LanMountainDesktop/ViewModels/DataSettingsPageViewModel.cs`
+
+- [ ] **Step 1: 创建 ViewModel**
+
+```csharp
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia.Threading;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.ViewModels;
+
+public sealed partial class DataStorageItemViewModel : ObservableObject
+{
+    public string Id { get; }
+    public string Name { get; }
+    public string Description { get; }
+    public string ColorHex { get; }
+    public bool IsCleanable { get; }
+
+    [ObservableProperty]
+    private string _sizeText = "--";
+
+    [ObservableProperty]
+    private double _percentage;
+
+    [ObservableProperty]
+    private bool _isCleaning;
+
+    public DataStorageItemViewModel(StorageCategoryInfo category)
+    {
+        Id = category.Id;
+        Name = category.Name;
+        Description = category.Description;
+        ColorHex = category.ColorHex;
+        IsCleanable = category.IsCleanable;
+    }
+
+    public void UpdateSize(long sizeBytes, double percentage)
+    {
+        SizeText = DataStorageService.FormatBytes(sizeBytes);
+        Percentage = percentage;
+    }
+}
+
+public sealed partial class DataSettingsPageViewModel : ViewModelBase
+{
+    private readonly DataStorageService _storageService = new();
+    private CancellationTokenSource? _scanCts;
+
+    [ObservableProperty]
+    private string _pageTitle = "数据与存储";
+
+    [ObservableProperty]
+    private string _totalSizeText = "--";
+
+    [ObservableProperty]
+    private string _diskUsageText = "--";
+
+    [ObservableProperty]
+    private double _diskUsagePercentage;
+
+    [ObservableProperty]
+    private bool _isScanning;
+
+    [ObservableProperty]
+    private bool _hasData;
+
+    public ObservableCollection<DataStorageItemViewModel> Items { get; } = new();
+
+    public DataSettingsPageViewModel()
+    {
+        var categories = _storageService.GetCategories();
+        foreach (var category in categories)
+        {
+            Items.Add(new DataStorageItemViewModel(category));
+        }
+
+        _ = ScanAsync();
+    }
+
+    [RelayCommand]
+    private async Task ScanAsync()
+    {
+        _scanCts?.Cancel();
+        _scanCts = new CancellationTokenSource();
+        var token = _scanCts.Token;
+
+        IsScanning = true;
+        try
+        {
+            var results = await _storageService.ScanAsync(token);
+            var totalSize = results.Sum(r => r.SizeBytes);
+            var totalDisk = await _storageService.GetTotalDiskSpaceAsync(token);
+
+            await Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                TotalSizeText = DataStorageService.FormatBytes(totalSize);
+                DiskUsagePercentage = totalDisk > 0 ? (double)totalSize / totalDisk * 100 : 0;
+                DiskUsageText = $"占总磁盘 {DiskUsagePercentage:F1}%";
+                HasData = totalSize > 0;
+
+                foreach (var result in results)
+                {
+                    var item = Items.FirstOrDefault(i =>
+                        string.Equals(i.Id, result.Category.Id, StringComparison.OrdinalIgnoreCase));
+                    item?.UpdateSize(result.SizeBytes, result.PercentageOfTotal);
+                }
+            });
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore cancellation
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", "Failed to scan storage.", ex);
+        }
+        finally
+        {
+            IsScanning = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task CleanAsync(string categoryId)
+    {
+        var item = Items.FirstOrDefault(i =>
+            string.Equals(i.Id, categoryId, StringComparison.OrdinalIgnoreCase));
+        if (item is null || !item.IsCleanable)
+        {
+            return;
+        }
+
+        item.IsCleaning = true;
+        try
+        {
+            await _storageService.CleanCategoryAsync(categoryId);
+            await ScanAsync();
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", $"Failed to clean category '{categoryId}'.", ex);
+        }
+        finally
+        {
+            item.IsCleaning = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task CleanAllAsync()
+    {
+        foreach (var item in Items.Where(i => i.IsCleanable))
+        {
+            item.IsCleaning = true;
+        }
+
+        try
+        {
+            foreach (var item in Items.Where(i => i.IsCleanable))
+            {
+                await _storageService.CleanCategoryAsync(item.Id);
+            }
+
+            await ScanAsync();
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", "Failed to clean all categories.", ex);
+        }
+        finally
+        {
+            foreach (var item in Items)
+            {
+                item.IsCleaning = false;
+            }
+        }
+    }
+}
+```
+
+---
+
+## Task 3: 创建 DataSettingsPage.axaml
+
+**Files:**
+- Create: `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml`
+
+- [ ] **Step 1: 创建 XAML 视图**
+
+```xml
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:LanMountainDesktop.ViewModels"
+             xmlns:ui="using:FluentAvalonia.UI.Controls"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             x:Class="LanMountainDesktop.Views.SettingsPages.DataSettingsPage"
+             x:DataType="vm:DataSettingsPageViewModel">
+    <ScrollViewer VerticalScrollBarVisibility="Auto">
+        <StackPanel Classes="settings-page-container settings-page-animated"
+                    Spacing="16">
+
+            <!-- 存储概览卡片 -->
+            <Border Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+                    CornerRadius="{DynamicResource DesignCornerRadiusMd}"
+                    Padding="20">
+                <StackPanel Spacing="12">
+                    <TextBlock Text="存储概览"
+                               FontSize="16"
+                               FontWeight="SemiBold" />
+
+                    <!-- 堆叠条形图 -->
+                    <Grid Height="28"
+                          IsVisible="{Binding HasData}">
+                        <Border Background="{DynamicResource ControlFillColorTertiaryBrush}"
+                                CornerRadius="{DynamicResource DesignCornerRadiusSm}"
+                                ClipToBounds="True">
+                            <StackPanel Orientation="Horizontal"
+                                        x:Name="StorageBarPanel">
+                                <!-- 动态生成分段 -->
+                            </StackPanel>
+                        </Border>
+                    </Grid>
+
+                    <!-- 总大小和磁盘占比 -->
+                    <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel Grid.Column="0"
+                                    Orientation="Horizontal"
+                                    Spacing="8">
+                            <TextBlock Text="{Binding TotalSizeText}"
+                                       FontSize="24"
+                                       FontWeight="SemiBold" />
+                            <TextBlock Text="{Binding DiskUsageText}"
+                                       VerticalAlignment="Bottom"
+                                       Margin="0,0,0,4"
+                                       Opacity="0.7" />
+                        </StackPanel>
+                        <Button Grid.Column="1"
+                                Command="{Binding ScanCommand}"
+                                IsEnabled="{Binding !IsScanning}"
+                                VerticalAlignment="Center">
+                            <StackPanel Orientation="Horizontal"
+                                        Spacing="6">
+                                <fi:FluentIcon Icon="ArrowSync"
+                                               IconVariant="Regular"
+                                               FontSize="14" />
+                                <TextBlock Text="刷新" />
+                            </StackPanel>
+                        </Button>
+                    </Grid>
+
+                    <!-- 图例 -->
+                    <ItemsControl ItemsSource="{Binding Items}"
+                                  IsVisible="{Binding HasData}">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <WrapPanel Orientation="Horizontal"
+                                           ItemWidth="140"
+                                           ItemHeight="28" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate x:DataType="vm:DataStorageItemViewModel">
+                                <StackPanel Orientation="Horizontal"
+                                            Spacing="6"
+                                            VerticalAlignment="Center">
+                                    <Border Width="12"
+                                            Height="12"
+                                            CornerRadius="2"
+                                            Background="{Binding ColorHex, Converter={StaticResource HexToBrushConverter}}" />
+                                    <TextBlock Text="{Binding Name}"
+                                               FontSize="12"
+                                               Opacity="0.8" />
+                                </StackPanel>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                </StackPanel>
+            </Border>
+
+            <!-- 数据类型详情列表 -->
+            <TextBlock Text="数据详情"
+                       FontSize="16"
+                       FontWeight="SemiBold"
+                       Margin="0,8,0,0" />
+
+            <ItemsControl ItemsSource="{Binding Items}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate x:DataType="vm:DataStorageItemViewModel">
+                        <Border Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+                                CornerRadius="{DynamicResource DesignCornerRadiusMd}"
+                                Padding="16"
+                                Margin="0,4">
+                            <Grid ColumnDefinitions="Auto,*,Auto,Auto"
+                                  ColumnSpacing="12">
+                                <Border Grid.Column="0"
+                                        Width="12"
+                                        Height="12"
+                                        CornerRadius="2"
+                                        Background="{Binding ColorHex, Converter={StaticResource HexToBrushConverter}}"
+                                        VerticalAlignment="Center" />
+
+                                <StackPanel Grid.Column="1"
+                                            VerticalAlignment="Center">
+                                    <TextBlock Text="{Binding Name}"
+                                               FontWeight="SemiBold" />
+                                    <TextBlock Text="{Binding Description}"
+                                               FontSize="12"
+                                               Opacity="0.6" />
+                                </StackPanel>
+
+                                <TextBlock Grid.Column="2"
+                                           Text="{Binding SizeText}"
+                                           VerticalAlignment="Center"
+                                           FontWeight="SemiBold"
+                                           Opacity="0.8" />
+
+                                <Button Grid.Column="3"
+                                        Command="{Binding $parent[ItemsControl].((vm:DataSettingsPageViewModel)DataContext).CleanCommand}"
+                                        CommandParameter="{Binding Id}"
+                                        IsVisible="{Binding IsCleanable}"
+                                        IsEnabled="{Binding !IsCleaning}"
+                                        VerticalAlignment="Center">
+                                    <StackPanel Orientation="Horizontal"
+                                                Spacing="4">
+                                        <fi:FluentIcon Icon="Delete"
+                                                       IconVariant="Regular"
+                                                       FontSize="14" />
+                                        <TextBlock Text="清理" />
+                                    </StackPanel>
+                                </Button>
+                            </Grid>
+                        </Border>
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+            <!-- 一键清理 -->
+            <Button Command="{Binding CleanAllCommand}"
+                    HorizontalAlignment="Stretch"
+                    HorizontalContentAlignment="Center"
+                    Margin="0,8">
+                <StackPanel Orientation="Horizontal"
+                            Spacing="6">
+                    <fi:FluentIcon Icon="Broom"
+                                   IconVariant="Regular"
+                                   FontSize="16" />
+                    <TextBlock Text="一键清理所有可清理数据" />
+                </StackPanel>
+            </Button>
+        </StackPanel>
+    </ScrollViewer>
+</UserControl>
+```
+
+---
+
+## Task 4: 创建 DataSettingsPage.axaml.cs
+
+**Files:**
+- Create: `LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml.cs`
+
+- [ ] **Step 1: 创建代码隐藏**
+
+```csharp
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.ViewModels;
+
+namespace LanMountainDesktop.Views.SettingsPages;
+
+[SettingsPageInfo(
+    "data",
+    "Data",
+    SettingsPageCategory.General,
+    IconKey = "Database",
+    SortOrder = 5,
+    TitleLocalizationKey = "settings.data.title",
+    DescriptionLocalizationKey = "settings.data.description")]
+public partial class DataSettingsPage : SettingsPageBase
+{
+    public DataSettingsPage()
+        : this(new DataSettingsPageViewModel())
+    {
+    }
+
+    public DataSettingsPage(DataSettingsPageViewModel viewModel)
+    {
+        ViewModel = viewModel;
+        DataContext = ViewModel;
+        InitializeComponent();
+    }
+
+    public DataSettingsPageViewModel ViewModel { get; }
+}
+```
+
+---
+
+## Task 5: 修改 SettingsWindow.axaml.cs 添加图标映射
+
+**Files:**
+- Modify: `LanMountainDesktop/Views/SettingsWindow.axaml.cs`
+
+- [ ] **Step 1: 在 MapIcon 方法中添加 Database 图标映射**
+
+在 `MapIcon` 方法的 switch 表达式中添加：
+
+```csharp
+"Database" => Symbol.Database,
+```
+
+---
+
+## Task 6: 添加颜色转换器（如需要）
+
+**Files:**
+- Modify: `LanMountainDesktop/Theme/` 或 `LanMountainDesktop/Controls/` 中的资源字典
+
+如果项目中没有 HexToBrushConverter，需要创建一个简单的值转换器：
+
+```csharp
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+
+namespace LanMountainDesktop.Converters;
+
+public class HexToBrushConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is string hex && !string.IsNullOrWhiteSpace(hex))
+        {
+            try
+            {
+                return new SolidColorBrush(Color.Parse(hex));
+            }
+            catch
+            {
+                // Ignore parse errors
+            }
+        }
+
+        return new SolidColorBrush(Colors.Gray);
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}
+```
+
+---
+
+## 测试验证
+
+1. 构建项目：`dotnet build LanMountainDesktop.slnx -c Debug`
+2. 运行应用：`dotnet run --project LanMountainDesktop/LanMountainDesktop.csproj`
+3. 打开设置窗口，确认「数据」选项卡出现在左侧导航中
+4. 点击「数据」选项卡，确认：
+   - 堆叠条形图显示各类数据占比
+   - 总大小和磁盘占比显示正确
+   - 数据详情列表显示每类数据大小
+   - 刷新按钮可以重新扫描
+   - 清理按钮可以清理对应数据

LanMountainDesktop/App.axaml

@@ -3,6 +3,7 @@
              xmlns:sty="using:FluentAvalonia.Styling"
              xmlns:fi="using:FluentIcons.Avalonia"
              xmlns:mi="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
+             xmlns:conv="using:LanMountainDesktop.Converters"
              x:Class="LanMountainDesktop.App"
              xmlns:local="using:LanMountainDesktop"
              RequestedThemeVariant="Default">
@@ -12,6 +13,8 @@
         <FontFamily x:Key="AppFontFamily">MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans, avares://LanMountainDesktop/Assets/Fonts#MiSans VF</FontFamily>
         <FontFamily x:Key="AppFontFamilyJP">avares://LanMountainDesktop/Assets/Fonts#MiSans JP</FontFamily>
         <FontFamily x:Key="AppFontFamilyKR">avares://LanMountainDesktop/Assets/Fonts#MiSans KR</FontFamily>
+        <conv:HexToColorConverter x:Key="HexToColorConverter" />
+        <conv:HexToBrushConverter x:Key="HexToBrushConverter" />
     </Application.Resources>
 
     <Application.DataTemplates>

LanMountainDesktop/Converters/HexToBrushConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+
+namespace LanMountainDesktop.Converters;
+
+public sealed class HexToBrushConverter : IValueConverter
+{
+    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is string hex && !string.IsNullOrWhiteSpace(hex))
+        {
+            try
+            {
+                return new SolidColorBrush(Color.Parse(hex));
+            }
+            catch
+            {
+                // Ignore parse errors
+            }
+        }
+
+        return Brushes.Gray;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

LanMountainDesktop/Converters/HexToColorConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+
+namespace LanMountainDesktop.Converters;
+
+public class HexToColorConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is string hex && !string.IsNullOrWhiteSpace(hex))
+        {
+            try
+            {
+                return Color.Parse(hex);
+            }
+            catch
+            {
+                // Ignore parse errors
+            }
+        }
+
+        return Colors.Gray;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

LanMountainDesktop/Localization/en-US.json

@@ -352,6 +352,8 @@
     "settings.general.slide_transition_desc":  "Use a slide-in startup transition on supported Windows builds. This option disables fade transition.",
     "settings.general.show_main_window_taskbar_header":  "Show main desktop window in taskbar",
     "settings.general.show_main_window_taskbar_desc":  "Keep the main desktop host window visible in the taskbar. The independent settings window always has its own taskbar entry.",
+    "settings.data.title":  "Data",
+    "settings.data.description":  "Review and manage local app storage and cache.",
     "settings.appearance.title":  "Appearance",
     "settings.appearance.description":  "Adjust theme source, system material, and window chrome.",
     "settings.appearance.theme_header":  "Theme",

LanMountainDesktop/Localization/ja-JP.json

@@ -287,6 +287,8 @@
     "settings.general.preview_time_label":  "時刻",
     "settings.general.preview_date_label":  "日付",
     "settings.general.render_mode_restart_message":  "レンダリングモードの変更にはアプリの再起動が必要です。",
+    "settings.data.title":  "データ",
+    "settings.data.description":  "ローカルに保存されたアプリデータとキャッシュを確認・管理します。",
     "settings.appearance.title":  "外観",
     "settings.appearance.description":  "テーマソース、システムマテリアル、ウィンドウクロームを調整します。",
     "settings.appearance.theme_header":  "テーマ",

LanMountainDesktop/Localization/ko-KR.json

@@ -335,6 +335,8 @@
     "settings.general.preview_time_label":  "시간",
     "settings.general.preview_date_label":  "날짜",
     "settings.general.render_mode_restart_message":  "렌더링 모드 변경은 앱 재시작이 필요합니다.",
+    "settings.data.title":  "데이터",
+    "settings.data.description":  "로컬에 저장된 앱 데이터와 캐시를 확인하고 관리합니다.",
     "settings.appearance.title":  "외관",
     "settings.appearance.description":  "테마 소스, 시스템 소재 및 창 외관을 조정합니다.",
     "settings.appearance.theme_header":  "테마",

LanMountainDesktop/Localization/zh-CN.json

@@ -352,6 +352,8 @@
     "settings.general.slide_transition_desc":  "在受支持的 Windows 版本上使用滑入启动过渡。启用后会关闭淡入淡出过渡。",
     "settings.general.show_main_window_taskbar_header":  "在任务栏显示主桌面窗口",
     "settings.general.show_main_window_taskbar_desc":  "让主桌面宿主窗口保持在任务栏中可见。独立设置窗口始终拥有自己的任务栏入口。",
+    "settings.data.title":  "数据",
+    "settings.data.description":  "查看与管理本机存储中的应用数据与缓存。",
     "settings.appearance.title":  "外观",
     "settings.appearance.description":  "调整主题来源、系统材质与窗口外观。",
     "settings.appearance.theme_header":  "主题",

LanMountainDesktop/Services/DataStorageService.cs

@@ -0,0 +1,357 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+public sealed record StorageCategoryInfo(
+    string Id,
+    string Name,
+    string Description,
+    string DirectoryPath,
+    bool IsCleanable,
+    string ColorHex);
+
+public sealed record StorageScanResult(
+    StorageCategoryInfo Category,
+    long SizeBytes,
+    double PercentageOfTotal);
+
+public sealed class DataStorageService
+{
+    private static readonly string[] SettingsRootFiles =
+    [
+        "settings.json",
+        "plugin-settings.json",
+        "launcher-settings.json",
+        "app.db",
+        "app.db-shm",
+        "app.db-wal"
+    ];
+
+    private static readonly string[] CategoryRelativeDirectories =
+    [
+        "Whiteboards",
+        "Extensions",
+        "PluginMarket",
+        "Wallpapers"
+    ];
+
+    private static readonly IReadOnlyList<StorageCategoryInfo> Categories = new List<StorageCategoryInfo>
+    {
+        new("logs", "日志文件", "应用运行日志", "", true, "#9E9E9E"),
+        new("whiteboards", "白板笔记", "桌面白板笔记数据", "Whiteboards", true, "#FF9800"),
+        new("plugins", "插件数据", "已安装插件文件", "Extensions/Plugins", true, "#2196F3"),
+        new("market", "插件市场缓存", "插件市场元数据缓存", "PluginMarket", true, "#9C27B0"),
+        new("wallpapers", "壁纸文件", "下载的壁纸资源", "Wallpapers", true, "#E91E63"),
+        new("settings", "设置文件", "应用配置数据", "", false, "#4CAF50")
+    };
+
+    public IReadOnlyList<StorageCategoryInfo> GetCategories() => Categories;
+
+    public async Task<IReadOnlyList<StorageScanResult>> ScanAsync(CancellationToken cancellationToken = default)
+    {
+        var results = new List<StorageScanResult>();
+        var dataRoot = AppDataPathProvider.GetDataRoot();
+        var logDirectory = AppLogger.LogDirectory;
+
+        long totalSize = 0;
+        var categorySizes = new Dictionary<string, long>();
+
+        foreach (var category in Categories)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            string path = category.Id switch
+            {
+                "logs" => logDirectory,
+                "settings" => dataRoot,
+                _ => Path.Combine(dataRoot, category.DirectoryPath)
+            };
+
+            long size = 0;
+            if (category.Id == "settings")
+            {
+                size = await GetSettingsSizeAsync(dataRoot, cancellationToken);
+            }
+            else if (Directory.Exists(path))
+            {
+                size = await GetDirectorySizeAsync(path, cancellationToken);
+            }
+
+            categorySizes[category.Id] = size;
+            totalSize += size;
+        }
+
+        foreach (var category in Categories)
+        {
+            var size = categorySizes.GetValueOrDefault(category.Id, 0);
+            var percentage = totalSize > 0 ? (double)size / totalSize * 100 : 0;
+            results.Add(new StorageScanResult(category, size, percentage));
+        }
+
+        return results;
+    }
+
+    public async Task<long> GetTotalDiskSpaceAsync(CancellationToken cancellationToken = default)
+    {
+        return await Task.Run(() =>
+        {
+            var dataRoot = AppDataPathProvider.GetDataRoot();
+            var pathRoot = Path.GetPathRoot(dataRoot);
+            if (string.IsNullOrWhiteSpace(pathRoot))
+            {
+                return 0;
+            }
+
+            var driveInfo = new DriveInfo(pathRoot);
+            return driveInfo.TotalSize;
+        }, cancellationToken);
+    }
+
+    public async Task<long> GetAvailableDiskSpaceAsync(CancellationToken cancellationToken = default)
+    {
+        return await Task.Run(() =>
+        {
+            var dataRoot = AppDataPathProvider.GetDataRoot();
+            var pathRoot = Path.GetPathRoot(dataRoot);
+            if (string.IsNullOrWhiteSpace(pathRoot))
+            {
+                return 0;
+            }
+
+            var driveInfo = new DriveInfo(pathRoot);
+            return driveInfo.AvailableFreeSpace;
+        }, cancellationToken);
+    }
+
+    public async Task<bool> CleanCategoryAsync(string categoryId, CancellationToken cancellationToken = default)
+    {
+        var category = Categories.FirstOrDefault(c =>
+            string.Equals(c.Id, categoryId, StringComparison.OrdinalIgnoreCase));
+
+        if (category is null || !category.IsCleanable)
+        {
+            return false;
+        }
+
+        var dataRoot = AppDataPathProvider.GetDataRoot();
+        string path = categoryId switch
+        {
+            "logs" => AppLogger.LogDirectory,
+            _ => Path.Combine(dataRoot, category.DirectoryPath)
+        };
+
+        if (!Directory.Exists(path))
+        {
+            return false;
+        }
+
+        return await Task.Run(() =>
+        {
+            try
+            {
+                if (categoryId == "logs")
+                {
+                    foreach (var file in Directory.GetFiles(path, "*.log"))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteFile(file);
+                    }
+                }
+                else
+                {
+                    foreach (var file in Directory.GetFiles(path, "*", SearchOption.AllDirectories))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteFile(file);
+                    }
+
+                    foreach (var dir in Directory.GetDirectories(path, "*", SearchOption.AllDirectories)
+                        .OrderByDescending(d => d.Length))
+                    {
+                        cancellationToken.ThrowIfCancellationRequested();
+                        TryDeleteDirectory(dir);
+                    }
+                }
+
+                AppLogger.Info("DataStorage", $"Cleaned category '{categoryId}' at '{path}'.");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DataStorage", $"Failed to clean category '{categoryId}'.", ex);
+                return false;
+            }
+        }, cancellationToken);
+    }
+
+    private static async Task<long> GetDirectorySizeAsync(string path, CancellationToken cancellationToken)
+    {
+        return await Task.Run(() => GetDirectorySizeCore(path, cancellationToken), cancellationToken);
+    }
+
+    private static async Task<long> GetSettingsSizeAsync(string dataRoot, CancellationToken cancellationToken)
+    {
+        return await Task.Run(() =>
+        {
+            long size = 0;
+            var countedFiles = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+
+            foreach (var file in SettingsRootFiles)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                var path = Path.Combine(dataRoot, file);
+                if (File.Exists(path))
+                {
+                    try
+                    {
+                        var fullPath = Path.GetFullPath(path);
+                        size += new FileInfo(fullPath).Length;
+                        countedFiles.Add(fullPath);
+                    }
+                    catch
+                    {
+                        // Ignore
+                    }
+                }
+            }
+
+            // Include root-level auxiliary files (exclude known category directories and logs).
+            try
+            {
+                var excludedDirs = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+                foreach (var relativeDir in CategoryRelativeDirectories)
+                {
+                    excludedDirs.Add(Path.GetFullPath(Path.Combine(dataRoot, relativeDir)));
+                }
+
+                var logDir = AppLogger.LogDirectory;
+                if (!string.IsNullOrWhiteSpace(logDir))
+                {
+                    excludedDirs.Add(Path.GetFullPath(logDir));
+                }
+
+                foreach (var file in Directory.EnumerateFiles(dataRoot, "*", SearchOption.TopDirectoryOnly))
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+
+                    try
+                    {
+                        var info = new FileInfo(file);
+                        if (!info.Exists)
+                        {
+                            continue;
+                        }
+
+                        var fullPath = Path.GetFullPath(file);
+                        if (countedFiles.Contains(fullPath))
+                        {
+                            continue;
+                        }
+
+                        size += info.Length;
+                        countedFiles.Add(fullPath);
+                    }
+                    catch
+                    {
+                        // Ignore file probe failures
+                    }
+                }
+
+                foreach (var directory in Directory.EnumerateDirectories(dataRoot, "*", SearchOption.TopDirectoryOnly))
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+                    var fullPath = Path.GetFullPath(directory);
+                    if (excludedDirs.Contains(fullPath))
+                    {
+                        continue;
+                    }
+
+                    size += GetDirectorySizeCore(fullPath, cancellationToken);
+                }
+            }
+            catch
+            {
+                // Ignore directory enumeration errors
+            }
+
+            return size;
+        }, cancellationToken);
+    }
+
+    private static long GetDirectorySizeCore(string path, CancellationToken cancellationToken)
+    {
+        long size = 0;
+        try
+        {
+            foreach (var file in Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories))
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                try
+                {
+                    var info = new FileInfo(file);
+                    if (info.Exists)
+                    {
+                        size += info.Length;
+                    }
+                }
+                catch
+                {
+                    // Ignore files we can't access
+                }
+            }
+        }
+        catch
+        {
+            // Ignore directories we can't access
+        }
+
+        return size;
+    }
+
+    private static void TryDeleteFile(string path)
+    {
+        try
+        {
+            File.SetAttributes(path, FileAttributes.Normal);
+            File.Delete(path);
+        }
+        catch
+        {
+            // Ignore deletion failures
+        }
+    }
+
+    private static void TryDeleteDirectory(string path)
+    {
+        try
+        {
+            Directory.Delete(path, false);
+        }
+        catch
+        {
+            // Ignore deletion failures
+        }
+    }
+
+    public static string FormatBytes(long bytes)
+    {
+        const long KB = 1024;
+        const long MB = KB * 1024;
+        const long GB = MB * 1024;
+        const long TB = GB * 1024;
+
+        return bytes switch
+        {
+            >= TB => $"{bytes / (double)TB:F2} TB",
+            >= GB => $"{bytes / (double)GB:F2} GB",
+            >= MB => $"{bytes / (double)MB:F2} MB",
+            >= KB => $"{bytes / (double)KB:F2} KB",
+            _ => $"{bytes} B"
+        };
+    }
+}

LanMountainDesktop/ViewModels/DataSettingsPageViewModel.cs

@@ -0,0 +1,181 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia.Threading;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.ViewModels;
+
+public sealed partial class DataStorageItemViewModel : ObservableObject
+{
+    public string Id { get; }
+    public string Name { get; }
+    public string Description { get; }
+    public string ColorHex { get; }
+    public bool IsCleanable { get; }
+
+    [ObservableProperty]
+    private string _sizeText = "--";
+
+    [ObservableProperty]
+    private double _percentage;
+
+    [ObservableProperty]
+    private bool _isCleaning;
+
+    public DataStorageItemViewModel(StorageCategoryInfo category)
+    {
+        Id = category.Id;
+        Name = category.Name;
+        Description = category.Description;
+        ColorHex = category.ColorHex;
+        IsCleanable = category.IsCleanable;
+    }
+
+    public void UpdateSize(long sizeBytes, double percentage)
+    {
+        SizeText = DataStorageService.FormatBytes(sizeBytes);
+        Percentage = percentage;
+    }
+}
+
+public sealed partial class DataSettingsPageViewModel : ViewModelBase
+{
+    private readonly DataStorageService _storageService = new();
+    private CancellationTokenSource? _scanCts;
+
+    [ObservableProperty]
+    private string _pageTitle = "数据";
+
+    [ObservableProperty]
+    private string _totalSizeText = "--";
+
+    [ObservableProperty]
+    private string _diskUsageText = "--";
+
+    [ObservableProperty]
+    private double _diskUsagePercentage;
+
+    [ObservableProperty]
+    private bool _isScanning;
+
+    [ObservableProperty]
+    private bool _hasData;
+
+    public ObservableCollection<DataStorageItemViewModel> Items { get; } = new();
+
+    public DataSettingsPageViewModel()
+    {
+        var categories = _storageService.GetCategories();
+        foreach (var category in categories)
+        {
+            Items.Add(new DataStorageItemViewModel(category));
+        }
+
+        _ = ScanAsync();
+    }
+
+    [RelayCommand]
+    private async Task ScanAsync()
+    {
+        _scanCts?.Cancel();
+        _scanCts = new CancellationTokenSource();
+        var token = _scanCts.Token;
+
+        IsScanning = true;
+        try
+        {
+            var results = await _storageService.ScanAsync(token);
+            var totalSize = results.Sum(r => r.SizeBytes);
+            var totalDisk = await _storageService.GetTotalDiskSpaceAsync(token);
+
+            await Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                TotalSizeText = DataStorageService.FormatBytes(totalSize);
+                DiskUsagePercentage = totalDisk > 0 ? (double)totalSize / totalDisk * 100 : 0;
+                DiskUsageText = $"占总磁盘 {DiskUsagePercentage:F1}%";
+                HasData = totalSize > 0;
+
+                foreach (var result in results)
+                {
+                    var item = Items.FirstOrDefault(i =>
+                        string.Equals(i.Id, result.Category.Id, StringComparison.OrdinalIgnoreCase));
+                    item?.UpdateSize(result.SizeBytes, result.PercentageOfTotal);
+                }
+            });
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore cancellation
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", "Failed to scan storage.", ex);
+        }
+        finally
+        {
+            IsScanning = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task CleanAsync(string categoryId)
+    {
+        var item = Items.FirstOrDefault(i =>
+            string.Equals(i.Id, categoryId, StringComparison.OrdinalIgnoreCase));
+        if (item is null || !item.IsCleanable)
+        {
+            return;
+        }
+
+        item.IsCleaning = true;
+        try
+        {
+            await _storageService.CleanCategoryAsync(categoryId);
+            await ScanAsync();
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", $"Failed to clean category '{categoryId}'.", ex);
+        }
+        finally
+        {
+            item.IsCleaning = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task CleanAllAsync()
+    {
+        foreach (var item in Items.Where(i => i.IsCleanable))
+        {
+            item.IsCleaning = true;
+        }
+
+        try
+        {
+            foreach (var item in Items.Where(i => i.IsCleanable))
+            {
+                await _storageService.CleanCategoryAsync(item.Id);
+            }
+
+            await ScanAsync();
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DataSettings", "Failed to clean all categories.", ex);
+        }
+        finally
+        {
+            foreach (var item in Items)
+            {
+                item.IsCleaning = false;
+            }
+        }
+    }
+}

LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml

@@ -0,0 +1,176 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:LanMountainDesktop.ViewModels"
+             xmlns:ui="using:FluentAvalonia.UI.Controls"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             x:Class="LanMountainDesktop.Views.SettingsPages.DataSettingsPage"
+             x:DataType="vm:DataSettingsPageViewModel">
+    <ScrollViewer VerticalScrollBarVisibility="Auto">
+        <StackPanel Classes="settings-page-container settings-page-animated"
+                    Spacing="0">
+
+            <ui:FASettingsExpander Classes="settings-expander-card"
+                                   Header="存储概览"
+                                   Description="本地应用数据的总占用及对当前磁盘的估算占比。"
+                                   IsExpanded="True">
+                <ui:FASettingsExpander.Footer>
+                    <Button Padding="12,8"
+                            Command="{Binding ScanCommand}"
+                            IsEnabled="{Binding !IsScanning}">
+                        <StackPanel Orientation="Horizontal"
+                                    Spacing="8">
+                            <fi:FluentIcon Icon="ArrowSync"
+                                           IconVariant="Regular"
+                                           FontSize="14" />
+                            <TextBlock Text="重新扫描" VerticalAlignment="Center" />
+                        </StackPanel>
+                    </Button>
+                </ui:FASettingsExpander.Footer>
+
+                <ui:FASettingsExpanderItem>
+                    <StackPanel Spacing="16">
+                        <Border Height="22"
+                                Background="{DynamicResource ControlFillColorTertiaryBrush}"
+                                CornerRadius="{DynamicResource DesignCornerRadiusSm}"
+                                ClipToBounds="True"
+                                IsVisible="{Binding HasData}">
+                            <Grid x:Name="StorageBarGrid" />
+                        </Border>
+
+                        <ProgressBar Height="8"
+                                     Minimum="0"
+                                     Maximum="100"
+                                     IsIndeterminate="{Binding IsScanning}"
+                                     Value="{Binding DiskUsagePercentage}" />
+
+                        <Grid ColumnDefinitions="*,Auto"
+                              ColumnSpacing="16">
+                            <StackPanel Spacing="4">
+                                <TextBlock Text="{Binding TotalSizeText}"
+                                           FontSize="22"
+                                           FontWeight="SemiBold" />
+                                <TextBlock Text="{Binding DiskUsageText}"
+                                           FontSize="13"
+                                           Opacity="0.72" />
+                            </StackPanel>
+                        </Grid>
+
+                        <TextBlock Text="正在扫描…"
+                                   FontSize="13"
+                                   Opacity="0.72"
+                                   IsVisible="{Binding IsScanning}" />
+
+                        <TextBlock Text="暂无可用数据。完成首次扫描后将显示占比与图例。"
+                                   FontSize="13"
+                                   Opacity="0.72"
+                                   TextWrapping="Wrap"
+                                   IsVisible="{Binding !HasData}" />
+
+                        <StackPanel Spacing="10"
+                                    IsVisible="{Binding HasData}">
+                            <TextBlock Classes="settings-item-label"
+                                       Text="分类图例" />
+                            <ItemsControl ItemsSource="{Binding Items}">
+                                <ItemsControl.ItemsPanel>
+                                    <ItemsPanelTemplate>
+                                        <WrapPanel Orientation="Horizontal" />
+                                    </ItemsPanelTemplate>
+                                </ItemsControl.ItemsPanel>
+                                <ItemsControl.ItemTemplate>
+                                    <DataTemplate x:DataType="vm:DataStorageItemViewModel">
+                                        <StackPanel Orientation="Horizontal"
+                                                    Spacing="8"
+                                                    VerticalAlignment="Center"
+                                                    Margin="0,0,16,8">
+                                            <Ellipse Width="10"
+                                                     Height="10"
+                                                     VerticalAlignment="Center"
+                                                     Fill="{Binding ColorHex, Converter={StaticResource HexToBrushConverter}}" />
+                                            <TextBlock Text="{Binding Name}"
+                                                       FontSize="13"
+                                                       VerticalAlignment="Center"
+                                                       Opacity="0.85" />
+                                            <TextBlock Text="{Binding Percentage, StringFormat={}{0:F1}%}"
+                                                       FontSize="12"
+                                                       VerticalAlignment="Center"
+                                                       Opacity="0.65" />
+                                        </StackPanel>
+                                    </DataTemplate>
+                                </ItemsControl.ItemTemplate>
+                            </ItemsControl>
+                        </StackPanel>
+                    </StackPanel>
+                </ui:FASettingsExpanderItem>
+            </ui:FASettingsExpander>
+
+            <ui:FASettingsExpander Classes="settings-expander-card"
+                                   Header="数据详情"
+                                   Description="按类别查看占用；可在允许清理的类别上释放空间。"
+                                   IsExpanded="True">
+                <ui:FASettingsExpanderItem>
+                    <ItemsControl ItemsSource="{Binding Items}">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate x:DataType="vm:DataStorageItemViewModel">
+                                <Grid ColumnDefinitions="Auto,*,Auto,Auto"
+                                      ColumnSpacing="14"
+                                      Margin="0,0,0,18">
+                                    <Ellipse Grid.Column="0"
+                                             Width="10"
+                                             Height="10"
+                                             VerticalAlignment="Center"
+                                             Fill="{Binding ColorHex, Converter={StaticResource HexToBrushConverter}}" />
+
+                                    <StackPanel Grid.Column="1"
+                                                VerticalAlignment="Center"
+                                                Spacing="4">
+                                        <TextBlock Classes="settings-item-label"
+                                                   Text="{Binding Name}" />
+                                        <TextBlock Classes="settings-item-description"
+                                                   Text="{Binding Description}" />
+                                    </StackPanel>
+
+                                    <TextBlock Grid.Column="2"
+                                               Text="{Binding SizeText}"
+                                               VerticalAlignment="Center"
+                                               FontWeight="SemiBold"
+                                               FontSize="13"
+                                               Opacity="0.9" />
+
+                                    <Button Grid.Column="3"
+                                            Command="{Binding $parent[ItemsControl].((vm:DataSettingsPageViewModel)DataContext).CleanCommand}"
+                                            CommandParameter="{Binding Id}"
+                                            IsVisible="{Binding IsCleanable}"
+                                            IsEnabled="{Binding !IsCleaning}"
+                                            VerticalAlignment="Center"
+                                            Padding="10,6">
+                                        <StackPanel Orientation="Horizontal"
+                                                    Spacing="6">
+                                            <fi:FluentIcon Icon="Delete"
+                                                           IconVariant="Regular"
+                                                           FontSize="14" />
+                                            <TextBlock Text="清理" VerticalAlignment="Center" />
+                                        </StackPanel>
+                                    </Button>
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                </ui:FASettingsExpanderItem>
+            </ui:FASettingsExpander>
+
+            <Button Classes="settings-accent-button"
+                    Command="{Binding CleanAllCommand}"
+                    HorizontalAlignment="Stretch"
+                    HorizontalContentAlignment="Center"
+                    Margin="0,4,0,0">
+                <StackPanel Orientation="Horizontal"
+                            Spacing="8">
+                    <fi:FluentIcon Icon="Broom"
+                                   IconVariant="Regular"
+                                   FontSize="16" />
+                    <TextBlock Text="一键清理所有可清理数据" VerticalAlignment="Center" />
+                </StackPanel>
+            </Button>
+        </StackPanel>
+    </ScrollViewer>
+</UserControl>

LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml.cs

@@ -0,0 +1,138 @@
+using System;
+using System.ComponentModel;
+using System.Linq;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Layout;
+using Avalonia.Media;
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.ViewModels;
+
+namespace LanMountainDesktop.Views.SettingsPages;
+
+[SettingsPageInfo(
+    "data",
+    "数据",
+    SettingsPageCategory.General,
+    IconKey = "HardDrive",
+    SortOrder = 5,
+    TitleLocalizationKey = "settings.data.title",
+    DescriptionLocalizationKey = "settings.data.description")]
+public partial class DataSettingsPage : SettingsPageBase
+{
+    private readonly SolidColorBrush _fallbackBrush = new(Colors.Gray);
+
+    public DataSettingsPage()
+        : this(new DataSettingsPageViewModel())
+    {
+    }
+
+    public DataSettingsPage(DataSettingsPageViewModel viewModel)
+    {
+        ViewModel = viewModel;
+        DataContext = ViewModel;
+        InitializeComponent();
+        AttachStorageBarObservers();
+        RebuildStorageBar();
+    }
+
+    public DataSettingsPageViewModel ViewModel { get; }
+
+    private void AttachStorageBarObservers()
+    {
+        ViewModel.PropertyChanged += OnViewModelPropertyChanged;
+        foreach (var item in ViewModel.Items)
+        {
+            item.PropertyChanged += OnStorageItemPropertyChanged;
+        }
+    }
+
+    private void OnViewModelPropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        if (string.Equals(e.PropertyName, nameof(DataSettingsPageViewModel.Items), StringComparison.Ordinal))
+        {
+            RebuildStorageBar();
+            return;
+        }
+
+        if (string.Equals(e.PropertyName, nameof(DataSettingsPageViewModel.HasData), StringComparison.Ordinal))
+        {
+            RebuildStorageBar();
+        }
+    }
+
+    private void OnStorageItemPropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        if (string.Equals(e.PropertyName, nameof(DataStorageItemViewModel.Percentage), StringComparison.Ordinal) ||
+            string.Equals(e.PropertyName, nameof(DataStorageItemViewModel.ColorHex), StringComparison.Ordinal))
+        {
+            RebuildStorageBar();
+        }
+    }
+
+    private void RebuildStorageBar()
+    {
+        if (StorageBarGrid is null)
+        {
+            return;
+        }
+
+        StorageBarGrid.ColumnDefinitions.Clear();
+        StorageBarGrid.Children.Clear();
+
+        if (!ViewModel.HasData)
+        {
+            return;
+        }
+
+        var visibleItems = ViewModel.Items
+            .Where(item => item.Percentage > 0)
+            .OrderByDescending(item => item.Percentage)
+            .ToList();
+
+        if (visibleItems.Count == 0)
+        {
+            return;
+        }
+
+        var totalPercent = visibleItems.Sum(item => item.Percentage);
+        if (totalPercent <= 0)
+        {
+            return;
+        }
+
+        var idx = 0;
+        foreach (var item in visibleItems)
+        {
+            var normalized = Math.Max(0.1, item.Percentage / totalPercent * 100d);
+            StorageBarGrid.ColumnDefinitions.Add(new ColumnDefinition(new GridLength(normalized, GridUnitType.Star)));
+
+            var segment = new Border
+            {
+                Background = ParseBrush(item.ColorHex),
+                HorizontalAlignment = HorizontalAlignment.Stretch,
+                VerticalAlignment = VerticalAlignment.Stretch
+            };
+
+            Grid.SetColumn(segment, idx++);
+            StorageBarGrid.Children.Add(segment);
+        }
+    }
+
+    private IBrush ParseBrush(string? hex)
+    {
+        if (string.IsNullOrWhiteSpace(hex))
+        {
+            return _fallbackBrush;
+        }
+
+        try
+        {
+            return new SolidColorBrush(Color.Parse(hex));
+        }
+        catch
+        {
+            return _fallbackBrush;
+        }
+    }
+}

LanMountainDesktop/Views/SettingsWindow.axaml.cs

@@ -1067,6 +1067,7 @@ public partial class SettingsWindow : FAAppWindow, ISettingsPageHostContext
             "DeveloperBoard" => Symbol.DeveloperBoard,
             "FolderLink" => Symbol.FolderLink,
             "WindowConsole" => Symbol.WindowConsole,
+            "HardDrive" => Symbol.HardDrive,
             _ => Symbol.Settings
         };
     }

LanMountainDesktop/installer/LanMountainDesktop.iss

@@ -129,11 +129,11 @@ Name: "startup"; Description: "{cm:StartupTaskDescription}"; GroupDescription: "
 Name: "{app}\log"; Permissions: users-modify
 
 [InstallDelete]
-Type: files; Name: "{app}\LanMontainDesktop.exe"
-Type: files; Name: "{app}\LanMontainDesktop.dll"
-Type: files; Name: "{app}\LanMontainDesktop.deps.json"
-Type: files; Name: "{app}\LanMontainDesktop.runtimeconfig.json"
-Type: files; Name: "{app}\LanMontainDesktop.pdb"
+Type: files; Name: "{app}\LanMountainDesktop.exe"
+Type: files; Name: "{app}\LanMountainDesktop.dll"
+Type: files; Name: "{app}\LanMountainDesktop.deps.json"
+Type: files; Name: "{app}\LanMountainDesktop.runtimeconfig.json"
+Type: files; Name: "{app}\LanMountainDesktop.pdb"
 
 [Files]
 Source: "{#PublishDir}\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
@@ -391,10 +391,6 @@ begin
   begin
     Params := Params + ' /SILENT';
   end;
-  if WizardVerySilent then
-  begin
-    Params := Params + ' /VERYSILENT';
-  end;
   
   { 重启安装程序并退出当前实例 }
   if Exec(ExpandConstant('{srcexe}'), Params, '', SW_SHOWNORMAL, ewNoWait, ResultCode) then