Support .laapp/plugin.json and improve market models

Add support for the new plugin package contract (.laapp + plugin.json) while keeping backward compatibility with legacy .lmdp/manifest.json, and improve market metadata resolution and launcher handling.

Key changes:
- LanMountainDesktop.Launcher: PluginInstallerService now recognizes plugin.json and .laapp, preserves legacy manifest/package names, searches for manifests with a helper, and removes existing packages matching either extension.
- LanMountainDesktop.PluginTemplate: README updated to document .laapp, plugin.json, runtime contract and packaging expectations.
- Tests: New and extended tests for PluginInstallerService and a PluginMarketIndexDocumentTests covering nested index parsing and metadata enrichment.
- LauncherClient & PluginMarketInstallService: ResolveLauncherPath now probes multiple candidate locations (useful for dev and packaged layouts); LauncherClient also adjusted launcher arguments to use the updated CLI form.
- SettingsDomainServices: Added BuildCapabilities to safely build capability lists from entries (null checks, projection, de-dup via DistinctBy).
- AirAppMarketMetadataResolverService & PluginMarketModels: Prefer existing manifest/publication/compatibility values when enriching entries, add ApiVersion/Path fields, normalize compatibility logic and package source URL/path handling; handle Sha256/size/publication dates more robustly.
- Misc: Added localization spec/checklist/tasks under .trae for a localization fix initiative.

These changes enable the new plugin packaging format, improve robustness of market data enrichment, make launcher discovery more flexible for different environments, and add tests and docs to cover the new behaviors.

.trae/specs/localization-fix/checklist.md

@@ -0,0 +1,42 @@
+# 本地化修复 Checklist
+
+## MainWindow 修复
+- [ ] `TaskbarProfileDisplayNameTextBlock.Text` 在中文下显示"用户"（或保持动态）
+- [ ] `TaskbarProfileSettingsActionTextBlock.Text` 在中文下显示"设置"
+- [ ] `TaskbarProfileDesktopEditActionTextBlock.Text` 在中文下显示"桌面编辑"
+- [ ] `TaskbarProfilePowerActionTextBlock.Text` 在中文下显示"电源"
+- [ ] `TaskbarPowerBackTextBlock.Text` 在中文下显示"返回"
+- [ ] `TaskbarPowerTitleTextBlock.Text` 在中文下显示"电源"
+- [ ] `PowerShutdownTextBlock.Text` 在中文下显示"关机"
+- [ ] `PowerRestartTextBlock.Text` 在中文下显示"重启"
+- [ ] `PowerLogoutTextBlock.Text` 在中文下显示"注销"
+- [ ] `PowerSleepTextBlock.Text` 在中文下显示"睡眠"
+- [ ] `PowerLockTextBlock.Text` 在中文下显示"锁定屏幕"
+- [ ] `ComponentLibraryTitleTextBlock.Text` 在中文下显示"桌面编辑"
+- [ ] `ComponentLibraryEmptyTextBlock.Text` 在中文下显示"左右滑动选择类别，点击进入，然后拖动组件到桌面放置。"
+- [ ] `ComponentLibraryBackTextBlock.Text` 在中文下显示"返回"
+- [ ] `ComponentLibraryCollapsedChipTextBlock.Text` 在中文下显示"桌面编辑"
+
+## Launcher 修复
+- [ ] `SplashWindow` 在中文下显示中文启动文本
+- [ ] `DataLocationPromptWindow` 在中文下全部显示中文
+- [ ] `ErrorWindow` 在中文下全部显示中文
+- [ ] `LoadingDetailsWindow` 在中文下全部显示中文
+- [ ] `UpdateWindow` 在中文下显示中文标题
+
+## 组件修复
+- [ ] `BrowserWidget` 在中文下显示"浏览器运行时不可用"
+- [ ] `WhiteboardWidget` 工具提示在中文下显示"笔"、"橡皮擦"、"清空"、"导出 SVG"
+- [ ] `HolidayCalendarWidget` 在中文下显示"节假日倒计时"、"天"
+- [ ] `BilibiliHotSearchWidget` 在中文下显示"热门话题"
+- [ ] `WallpaperSettingsPage` 自定义颜色 Tooltip 在中文下显示"自定义颜色"
+
+## 资源文件
+- [ ] `zh-CN.json` 包含所有新增键值
+- [ ] `en-US.json` 包含所有新增键值
+- [ ] Launcher 本地化文件包含所有新增键值
+
+## 构建与质量
+- [ ] `dotnet build LanMountainDesktop.slnx -c Debug` 编译通过，无错误
+- [ ] 无新增警告
+- [ ] 无遗漏的硬编码英文（通过 `grep -r 'Text="[a-zA-Z]'` 等检查）

.trae/specs/localization-fix/spec.md

@@ -0,0 +1,85 @@
+# 本地化修复 Spec
+
+## Why
+
+- 项目在中文设置下，多处 UI 仍显示英文。
+- 主要问题集中在：
+  1. `MainWindow.axaml` 中任务栏头像弹窗、电源菜单、组件库等文本硬编码为英文，且未被 `ApplyLocalization()` 覆盖。
+  2. `LanMountainDesktop.Launcher` 的所有视图完全没有接入本地化系统。
+  3. 部分组件（BrowserWidget、WhiteboardWidget、HolidayCalendarWidget 等）存在未覆盖的硬编码英文。
+  4. 少量设置页面 Tooltip 硬编码英文。
+
+## What Changes
+
+### 1. MainWindow.axaml 硬编码修复
+将以下硬编码文本改为由 `ApplyLocalization()` 通过 `L()` 动态设置：
+- 任务栏头像弹窗：`User` → `power.user` / `Settings` → `settings.title` / `Edit Desktop` → `button.component_library` / `Power` → `power.title`
+- 电源菜单：`Back` → `common.back` / `Power` → `power.title` / `Shutdown` → `power.shutdown` / `Restart` → `power.restart` / `Log Out` → `power.logout` / `Sleep` → `power.sleep` / `Lock Screen` → `power.lock_screen`
+- 组件库：`Widgets` → `component_library.title` / `Back` → `common.back` / `No components.` → `component_library.empty`
+- 悬浮芯片：`Widgets` → `component_library.title`
+
+### 2. Launcher 视图本地化
+为 `LanMountainDesktop.Launcher/Views/` 下的窗口引入独立本地化机制（复用 `LocalizationService` 或内嵌资源字典）：
+- `SplashWindow.axaml`：`LanMountain Desktop`、`Initializing...`
+- `DataLocationPromptWindow.axaml`：全部文本
+- `ErrorWindow.axaml`：全部文本
+- `LoadingDetailsWindow.axaml`：全部文本
+- `UpdateWindow.axaml`：`Update`
+
+### 3. 组件硬编码修复
+- `BrowserWidget.axaml`：`Browser runtime unavailable.` → 新增键 `browser.widget.unavailable`
+- `WhiteboardWidget.axaml`：`Pen` / `Eraser` / `Clear` / `Export SVG` → 新增键 `whiteboard.tool.pen` 等
+- `HolidayCalendarWidget.axaml`：`Holiday countdown` / `Days` → 新增键 `holiday.widget.title` / `holiday.widget.days`
+- `BilibiliHotSearchWidget.axaml`：`Trending Topic` → 新增键 `bilihot.widget.trending_topic`
+- `WallpaperSettingsPage.axaml`：`Custom color` Tooltip → 复用 `settings.wallpaper.custom_color_tooltip`
+
+### 4. 本地化资源文件补充
+在 `zh-CN.json` 和 `en-US.json` 中补充上述新增键值。
+
+## Impact
+
+- Affected code:
+  - `LanMountainDesktop/Views/MainWindow.axaml`
+  - `LanMountainDesktop/Views/MainWindow.SettingsHardCut.Stubs.cs`
+  - `LanMountainDesktop.Launcher/Views/*.axaml`（多个文件）
+  - `LanMountainDesktop/Views/Components/BrowserWidget.axaml`
+  - `LanMountainDesktop/Views/Components/WhiteboardWidget.axaml`
+  - `LanMountainDesktop/Views/Components/HolidayCalendarWidget.axaml`
+  - `LanMountainDesktop/Views/Components/BilibiliHotSearchWidget.axaml`
+  - `LanMountainDesktop/Views/SettingsPages/WallpaperSettingsPage.axaml`
+  - `LanMountainDesktop/Localization/zh-CN.json`
+  - `LanMountainDesktop/Localization/en-US.json`
+- Affected behavior:
+  - 中文设置下上述位置将正确显示中文。
+  - Launcher 各窗口将支持中英文切换。
+
+---
+
+## Requirements
+
+### Requirement: MainWindow 任务栏弹窗与电源菜单本地化
+系统 SHALL 在 `ApplyLocalization()` 中覆盖任务栏头像弹窗和电源菜单的所有文本。
+
+#### Scenario: 中文设置下打开任务栏弹窗
+- **WHEN** 语言设置为中文
+- **THEN** 弹窗中显示"设置"、"桌面编辑"、"电源"等中文文本
+- **AND THEN** 电源菜单中显示"返回"、"关机"、"重启"、"注销"、"睡眠"、"锁定屏幕"等中文文本
+
+### Requirement: Launcher 窗口本地化
+系统 SHALL 让 Launcher 的所有窗口文本通过本地化服务获取。
+
+#### Scenario: 中文设置下启动应用
+- **WHEN** 语言设置为中文
+- **THEN** SplashWindow 显示中文启动文本
+- **AND THEN** 数据位置选择、错误页、加载详情页等显示中文
+
+### Requirement: 组件与设置页硬编码修复
+系统 SHALL 移除或覆盖所有组件和设置页中的英文硬编码文本。
+
+#### Scenario: 中文设置下查看各组件
+- **WHEN** 语言设置为中文
+- **THEN** BrowserWidget 显示"浏览器运行时不可用"
+- **AND THEN** WhiteboardWidget 工具提示显示"笔"、"橡皮擦"、"清空"、"导出 SVG"
+- **AND THEN** HolidayCalendarWidget 显示"节假日倒计时"、"天"
+- **AND THEN** BilibiliHotSearchWidget 显示"热门话题"
+- **AND THEN** 壁纸设置页自定义颜色 Tooltip 显示"自定义颜色"

.trae/specs/localization-fix/tasks.md

@@ -0,0 +1,39 @@
+# 本地化修复 Tasks
+
+## Task 1: MainWindow.axaml 硬编码文本移除与代码覆盖
+- [ ] 1.1 在 `MainWindow.axaml` 中，将任务栏头像弹窗的 `User`、`Settings`、`Edit Desktop`、`Power` 的 `Text` 属性改为空或绑定（保留 x:Name）
+- [ ] 1.2 在 `MainWindow.axaml` 中，将电源菜单的 `Back`、`Power`、`Shutdown`、`Restart`、`Log Out`、`Sleep`、`Lock Screen` 的 `Text` 属性改为空或绑定
+- [ ] 1.3 在 `MainWindow.axaml` 中，将组件库的 `Widgets`、`Back`、`No components.` 的 `Text` 属性改为空或绑定
+- [ ] 1.4 在 `MainWindow.axaml` 中，将悬浮芯片的 `Widgets` 的 `Text` 属性改为空或绑定
+- [ ] 1.5 在 `MainWindow.SettingsHardCut.Stubs.cs` 的 `ApplyLocalization()` 中补充上述所有控件的 `L()` 赋值
+
+## Task 2: Launcher 视图本地化
+- [ ] 2.1 在 `LanMountainDesktop.Launcher` 中引入 `LocalizationService`（或共享主应用服务）
+- [ ] 2.2 为 Launcher 创建独立的 `Localization/` 目录和 `zh-CN.json` / `en-US.json`
+- [ ] 2.3 修改 `SplashWindow.axaml`：将 `LanMountain Desktop`、`Initializing...` 改为动态绑定
+- [ ] 2.4 修改 `DataLocationPromptWindow.axaml`：将所有文本改为动态绑定
+- [ ] 2.5 修改 `ErrorWindow.axaml`：将所有文本改为动态绑定
+- [ ] 2.6 修改 `LoadingDetailsWindow.axaml`：将所有文本改为动态绑定
+- [ ] 2.7 修改 `UpdateWindow.axaml`：将 `Update` 改为动态绑定
+- [ ] 2.8 在 Launcher 启动流程中初始化语言设置
+
+## Task 3: 组件硬编码修复
+- [ ] 3.1 `BrowserWidget.axaml`：将 `Browser runtime unavailable.` 改为绑定，并在代码后置中通过 `L()` 设置
+- [ ] 3.2 `WhiteboardWidget.axaml`：将 `Pen`、`Eraser`、`Clear`、`Export SVG` Tooltip 改为绑定，并在代码后置中通过 `L()` 设置
+- [ ] 3.3 `HolidayCalendarWidget.axaml`：将 `Holiday countdown`、`Days` 改为绑定，并在代码后置中通过 `L()` 设置
+- [ ] 3.4 `BilibiliHotSearchWidget.axaml`：将 `Trending Topic` 改为绑定，并在代码后置中通过 `L()` 设置
+- [ ] 3.5 `WallpaperSettingsPage.axaml`：将 `Custom color` Tooltip 改为绑定到 `settings.wallpaper.custom_color_tooltip`
+
+## Task 4: 本地化资源文件补充
+- [ ] 4.1 在 `zh-CN.json` 中补充以下键值：
+  - `browser.widget.unavailable`
+  - `whiteboard.tool.pen`、`whiteboard.tool.eraser`、`whiteboard.tool.clear`、`whiteboard.tool.export_svg`
+  - `holiday.widget.title`、`holiday.widget.days`
+  - `bilihot.widget.trending_topic`
+  - `power.user`（或复用现有键）
+- [ ] 4.2 在 `en-US.json` 中补充上述键值的英文版本
+- [ ] 4.3 为 Launcher 创建独立的本地化 JSON 文件并填充中英文
+
+## Task 5: 验证
+- [ ] 5.1 执行 `dotnet build LanMountainDesktop.slnx -c Debug` 确保编译通过
+- [ ] 5.2 检查是否有遗漏的硬编码英文（通过正则搜索）

LanMountainDesktop.Launcher/Services/PluginInstallerService.cs

@@ -9,8 +9,10 @@ namespace LanMountainDesktop.Launcher.Services;
 /// </summary>
 internal sealed class PluginInstallerService
 {
-    private const string ManifestFileName = "manifest.json";
-    private const string PackageFileExtension = ".lmdp";
+    private const string ManifestFileName = "plugin.json";
+    private const string LegacyManifestFileName = "manifest.json";
+    private const string PackageFileExtension = ".laapp";
+    private const string LegacyPackageFileExtension = ".lmdp";
     private const string RuntimeDirectoryName = "runtime";
     
     private static readonly TimeSpan[] RetryDelays =
@@ -114,14 +116,16 @@ internal sealed class PluginInstallerService
     public PluginManifest ReadManifestFromPackage(string packagePath)
     {
         using var archive = ZipFile.OpenRead(packagePath);
-        var entries = archive.Entries
-            .Where(entry => string.Equals(entry.Name, ManifestFileName, StringComparison.OrdinalIgnoreCase))
-            .ToArray();
+        var entries = FindManifestEntries(archive, ManifestFileName);
+        if (entries.Length == 0)
+        {
+            entries = FindManifestEntries(archive, LegacyManifestFileName);
+        }
 
         if (entries.Length == 0)
         {
             throw new InvalidOperationException(
-                $"Plugin package '{packagePath}' does not contain '{ManifestFileName}'.");
+                $"Plugin package '{packagePath}' does not contain '{ManifestFileName}' or '{LegacyManifestFileName}'.");
         }
 
         if (entries.Length > 1)
@@ -141,6 +145,13 @@ internal sealed class PluginInstallerService
         return manifest;
     }
 
+    private static ZipArchiveEntry[] FindManifestEntries(ZipArchive archive, string manifestFileName)
+    {
+        return archive.Entries
+            .Where(entry => string.Equals(entry.Name, manifestFileName, StringComparison.OrdinalIgnoreCase))
+            .ToArray();
+    }
+
     private void RemoveExistingPluginPackages(string pluginsDirectory, string pluginId, string destinationPath, string stagingPath)
     {
         var runtimeRootDirectory = EnsureTrailingSeparator(Path.Combine(Path.GetFullPath(pluginsDirectory), RuntimeDirectoryName));
@@ -148,8 +159,11 @@ internal sealed class PluginInstallerService
         Directory.CreateDirectory(pendingDeletionDir);
 
         foreach (var existingPackagePath in Directory
-                     .EnumerateFiles(pluginsDirectory, "*" + PackageFileExtension, SearchOption.AllDirectories)
+                     .EnumerateFiles(pluginsDirectory, "*", SearchOption.AllDirectories)
                      .Select(Path.GetFullPath)
+                     .Where(path =>
+                         path.EndsWith(PackageFileExtension, StringComparison.OrdinalIgnoreCase) ||
+                         path.EndsWith(LegacyPackageFileExtension, StringComparison.OrdinalIgnoreCase))
                      .Where(path => !path.StartsWith(runtimeRootDirectory, StringComparison.OrdinalIgnoreCase)))
         {
             try

LanMountainDesktop.PluginTemplate/README.md

@@ -2,6 +2,14 @@
 
 Official `dotnet new` template package for LanMountainDesktop plugins.
 
+## Baseline
+
+- Target framework: `net10.0`
+- Plugin SDK: `LanMountainDesktop.PluginSdk` `5.0.0`
+- Manifest: `plugin.json`
+- Package: `.laapp`
+- Runtime mode: `in-proc`
+
 ## Install
 
 ```powershell
@@ -15,3 +23,19 @@ dotnet new lmd-plugin -n YourPluginName
 ```
 
 The generated project references `LanMountainDesktop.PluginSdk` and produces a `.laapp` package automatically when built.
+
+## Package contract
+
+Every plugin package must contain:
+
+- `plugin.json`
+- the entrance assembly declared by `entranceAssembly`
+- the `.deps.json` next to the entrance assembly
+
+Optional package content:
+
+- `Localization/*.json`
+- plugin assets and other managed dependencies
+- `airappmarket-entry.template.json` in the repository root for market publishing
+
+Market publishing uses `market-manifest.json` with `schemaVersion`, `manifest`, `compatibility`, `repository`, `publication.packageSources`, and `capabilities`.

LanMountainDesktop.Tests/PluginInstallerServiceTests.cs

@@ -1,4 +1,5 @@
 using LanMountainDesktop.Launcher.Services;
+using System.IO.Compression;
 using Xunit;
 
 namespace LanMountainDesktop.Tests;
@@ -26,6 +27,96 @@ public sealed class PluginInstallerServiceTests : IDisposable
         Assert.Equal("plugin_elevation_required", result.Code);
     }
 
+    [Fact]
+    public void InstallPackage_InstallsLaappWithPluginJson_InsideUserScope()
+    {
+        var packagePath = Path.Combine(_tempRoot, "sample.laapp");
+        Directory.CreateDirectory(_tempRoot);
+        CreatePluginPackage(packagePath, "plugin.json", "plugin.install.sample", "Sample Plugin");
+
+        var pluginsDirectory = CreateUserScopedPluginsDirectory();
+        var service = new PluginInstallerService();
+
+        var result = service.InstallPackage(packagePath, pluginsDirectory);
+
+        Assert.True(result.Success);
+        Assert.Equal("ok", result.Code);
+        Assert.Equal("plugin.install.sample", result.ManifestId);
+        Assert.Equal("Sample Plugin", result.ManifestName);
+        Assert.NotNull(result.InstalledPackagePath);
+        Assert.True(File.Exists(result.InstalledPackagePath));
+        Assert.EndsWith(".laapp", result.InstalledPackagePath, StringComparison.OrdinalIgnoreCase);
+        Assert.Empty(Directory.EnumerateFiles(pluginsDirectory, "*.incoming", SearchOption.AllDirectories));
+    }
+
+    [Fact]
+    public void InstallPackage_ReplacesExistingPackageWithSamePluginId()
+    {
+        Directory.CreateDirectory(_tempRoot);
+        var firstPackagePath = Path.Combine(_tempRoot, "sample-1.laapp");
+        var secondPackagePath = Path.Combine(_tempRoot, "sample-2.laapp");
+        CreatePluginPackage(firstPackagePath, "plugin.json", "plugin.replace.sample", "Sample Plugin v1");
+        CreatePluginPackage(secondPackagePath, "plugin.json", "plugin.replace.sample", "Sample Plugin v2");
+
+        var pluginsDirectory = CreateUserScopedPluginsDirectory();
+        var service = new PluginInstallerService();
+
+        var first = service.InstallPackage(firstPackagePath, pluginsDirectory);
+        var second = service.InstallPackage(secondPackagePath, pluginsDirectory);
+
+        Assert.True(first.Success);
+        Assert.True(second.Success);
+        Assert.Single(Directory.EnumerateFiles(pluginsDirectory, "*.laapp", SearchOption.TopDirectoryOnly));
+        Assert.True(File.Exists(second.InstalledPackagePath));
+    }
+
+    [Fact]
+    public void InstallPackage_StillSupportsLegacyManifestJson()
+    {
+        var packagePath = Path.Combine(_tempRoot, "legacy.lmdp");
+        Directory.CreateDirectory(_tempRoot);
+        CreatePluginPackage(packagePath, "manifest.json", "plugin.legacy.sample", "Legacy Plugin");
+
+        var pluginsDirectory = CreateUserScopedPluginsDirectory();
+        var service = new PluginInstallerService();
+
+        var result = service.InstallPackage(packagePath, pluginsDirectory);
+
+        Assert.True(result.Success);
+        Assert.Equal("plugin.legacy.sample", result.ManifestId);
+        Assert.True(File.Exists(result.InstalledPackagePath));
+    }
+
+    private static void CreatePluginPackage(string packagePath, string manifestFileName, string pluginId, string pluginName)
+    {
+        using var archive = ZipFile.Open(packagePath, ZipArchiveMode.Create);
+        var entry = archive.CreateEntry(manifestFileName);
+        using var stream = entry.Open();
+        using var writer = new StreamWriter(stream);
+        writer.Write(
+            $$"""
+              {
+                "id": "{{pluginId}}",
+                "name": "{{pluginName}}",
+                "version": "1.0.0"
+              }
+              """);
+    }
+
+    private static string CreateUserScopedPluginsDirectory()
+    {
+        var root = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "LanMountainDesktop",
+            "Tests",
+            nameof(PluginInstallerServiceTests),
+            Guid.NewGuid().ToString("N"),
+            "Extensions",
+            "Plugins");
+        Directory.CreateDirectory(root);
+        return root;
+    }
+
     public void Dispose()
     {
         try

LanMountainDesktop.Tests/PluginMarketIndexDocumentTests.cs

@@ -0,0 +1,127 @@
+using LanMountainDesktop.Services.PluginMarket;
+using System.Net;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class PluginMarketIndexDocumentTests
+{
+    [Fact]
+    public void Load_WithNestedV2Entry_MapsDisplayFieldsAndWorkspacePath()
+    {
+        var document = AirAppMarketIndexDocument.Load(CreateNestedIndexJson(), "test-index.json");
+        var plugin = Assert.Single(document.Plugins);
+        var source = Assert.Single(plugin.PackageSources);
+
+        Assert.Equal("LanMountainDesktop.SamplePlugin", plugin.Id);
+        Assert.Equal("LanMountain Sample Plugin", plugin.Name);
+        Assert.Equal("SDK v5 sample plugin.", plugin.Description);
+        Assert.Equal("LanMountainDesktop", plugin.Author);
+        Assert.Equal("0.4.0", plugin.Version);
+        Assert.Equal("5.0.0", plugin.ApiVersion);
+        Assert.Equal("0.0.1", plugin.MinHostVersion);
+        Assert.Equal("https://raw.githubusercontent.com/wwiinnddyy/LanAirApp/main/airappmarket/assets/sample-plugin.svg", plugin.IconUrl);
+        Assert.Equal("https://raw.githubusercontent.com/wwiinnddyy/LanMountainDesktop.SamplePlugin/main/README.md", plugin.ReadmeUrl);
+        Assert.Equal("workspace://LanMountainDesktop.SamplePlugin/LanMountainDesktop.SamplePlugin.0.4.0.laapp", source.Url);
+        Assert.Equal(PluginPackageSourceKind.WorkspaceLocal, source.SourceKind);
+    }
+
+    [Fact]
+    public async Task EnrichAsync_WhenRepositoryMetadataUnavailable_PreservesNestedDisplayFields()
+    {
+        var document = AirAppMarketIndexDocument.Load(
+            CreateNestedIndexJson("LanMountainDesktop.MissingPlugin"),
+            "test-index.json");
+        using var httpClient = new HttpClient(new NotFoundHandler());
+        using var resolver = new AirAppMarketMetadataResolverService(httpClient);
+
+        var enriched = await resolver.EnrichAsync(document);
+        var plugin = Assert.Single(enriched.Plugins);
+
+        Assert.Equal("LanMountain Sample Plugin", plugin.Name);
+        Assert.Equal("SDK v5 sample plugin.", plugin.Description);
+        Assert.Equal("LanMountainDesktop", plugin.Author);
+        Assert.Equal("0.4.0", plugin.Version);
+        Assert.Equal("5.0.0", plugin.ApiVersion);
+        Assert.Equal("0.0.1", plugin.MinHostVersion);
+        Assert.Equal("v0.4.0", plugin.ReleaseTag);
+        Assert.Equal("LanMountainDesktop.SamplePlugin.0.4.0.laapp", plugin.ReleaseAssetName);
+        Assert.Equal("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", plugin.Sha256);
+        Assert.Equal(1024, plugin.PackageSizeBytes);
+    }
+
+    private static string CreateNestedIndexJson(string repositoryName = "LanMountainDesktop.SamplePlugin")
+    {
+        return $$"""
+            {
+              "schemaVersion": "2.0.0",
+              "sourceId": "official",
+              "sourceName": "LanAirApp",
+              "generatedAt": "2026-04-29T00:00:00Z",
+              "contracts": [],
+              "plugins": [
+                {
+                  "manifest": {
+                    "id": "LanMountainDesktop.SamplePlugin",
+                    "name": "LanMountain Sample Plugin",
+                    "description": "SDK v5 sample plugin.",
+                    "author": "LanMountainDesktop",
+                    "version": "0.4.0",
+                    "apiVersion": "5.0.0",
+                    "entranceAssembly": "LanMountainDesktop.SamplePlugin.dll",
+                    "sharedContracts": []
+                  },
+                  "compatibility": {
+                    "minHostVersion": "0.0.1",
+                    "apiVersion": "5.0.0"
+                  },
+                  "repository": {
+                    "projectUrl": "https://github.com/wwiinnddyy/{{repositoryName}}",
+                    "readmeUrl": "https://raw.githubusercontent.com/wwiinnddyy/{{repositoryName}}/main/README.md",
+                    "homepageUrl": "https://github.com/wwiinnddyy/{{repositoryName}}",
+                    "repositoryUrl": "https://github.com/wwiinnddyy/{{repositoryName}}",
+                    "iconUrl": "https://raw.githubusercontent.com/wwiinnddyy/LanAirApp/main/airappmarket/assets/sample-plugin.svg",
+                    "tags": [ "official", "sdk" ],
+                    "releaseNotes": "Reference plugin for SDK v5 validation."
+                  },
+                  "publication": {
+                    "releaseTag": "v0.4.0",
+                    "releaseAssetName": "LanMountainDesktop.SamplePlugin.0.4.0.laapp",
+                    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                    "packageSizeBytes": 1024,
+                    "publishedAt": "2026-04-29T00:00:00Z",
+                    "updatedAt": "2026-04-29T00:00:00Z",
+                    "packageSources": [
+                      {
+                        "kind": "workspaceLocal",
+                        "path": "workspace://LanMountainDesktop.SamplePlugin/LanMountainDesktop.SamplePlugin.0.4.0.laapp",
+                        "assetName": "LanMountainDesktop.SamplePlugin.0.4.0.laapp",
+                        "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                        "sizeBytes": 1024,
+                        "releaseTag": "v0.4.0",
+                        "priority": 0
+                      }
+                    ]
+                  },
+                  "capabilities": {
+                    "desktopComponents": [ "LanMountainDesktop.SamplePlugin.StatusClock" ],
+                    "settingsSections": [ "status" ]
+                  }
+                }
+              ]
+            }
+            """;
+    }
+
+    private sealed class NotFoundHandler : HttpMessageHandler
+    {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new HttpResponseMessage(HttpStatusCode.NotFound)
+            {
+                RequestMessage = request,
+                Content = new StringContent("{}")
+            });
+        }
+    }
+}

LanMountainDesktop/Services/LauncherClient.cs

@@ -3,6 +3,7 @@ using System.ComponentModel;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
@@ -111,7 +112,7 @@ internal sealed class LauncherClient
             WorkingDirectory = Path.GetDirectoryName(launcherPath) ?? AppContext.BaseDirectory,
             Arguments = string.Create(
                 CultureInfo.InvariantCulture,
-                $"--source {QuoteArgument(Path.GetFullPath(packagePath))} --plugins-dir {QuoteArgument(Path.GetFullPath(pluginsDirectory))} --result {QuoteArgument(Path.GetFullPath(resultPath))} --launch-source plugin-install")
+                $"plugin install --source {QuoteArgument(Path.GetFullPath(packagePath))} --plugins-dir {QuoteArgument(Path.GetFullPath(pluginsDirectory))} --result {QuoteArgument(Path.GetFullPath(resultPath))} --launch-source plugin-install")
         };
 
         return Process.Start(startInfo);
@@ -130,7 +131,17 @@ internal sealed class LauncherClient
 
     private static string ResolveLauncherPath()
     {
-        return Path.Combine(AppContext.BaseDirectory, "Launcher", LauncherExecutableName);
+        var baseDirectory = AppContext.BaseDirectory;
+        var candidates = new[]
+        {
+            Path.Combine(baseDirectory, "Launcher", LauncherExecutableName),
+            Path.Combine(baseDirectory, LauncherExecutableName),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "LanMountainDesktop.Launcher", LauncherExecutableName)),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "..", "..", "..", "LanMountainDesktop.Launcher", "bin", "Debug", "net10.0", LauncherExecutableName)),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "..", "..", "..", "LanMountainDesktop.Launcher", "bin", "Release", "net10.0", LauncherExecutableName))
+        };
+
+        return candidates.FirstOrDefault(File.Exists) ?? candidates[0];
     }
 
     private static string QuoteArgument(string value)

LanMountainDesktop/Services/Settings/SettingsDomainServices.cs

@@ -1236,7 +1236,31 @@ internal sealed class PluginCatalogSettingsService : IPluginCatalogSettingsServi
             repository,
             publication,
             sources,
-            []);
+            BuildCapabilities(entry));
+    }
+
+    private static IReadOnlyList<PluginCapabilityInfo> BuildCapabilities(AirAppMarketPluginEntry entry)
+    {
+        if (entry.Capabilities is null)
+        {
+            return [];
+        }
+
+        var capabilities = new List<PluginCapabilityInfo>();
+        capabilities.AddRange(entry.Capabilities.SharedContracts.Select(contract =>
+            new PluginCapabilityInfo(contract.Id, contract.Version, contract.AssemblyName)));
+        capabilities.AddRange(entry.Capabilities.DesktopComponents.Select(id =>
+            new PluginCapabilityInfo(id, null, null)));
+        capabilities.AddRange(entry.Capabilities.SettingsSections.Select(id =>
+            new PluginCapabilityInfo(id, null, null)));
+        capabilities.AddRange(entry.Capabilities.Exports.Select(id =>
+            new PluginCapabilityInfo(id, null, null)));
+        capabilities.AddRange(entry.Capabilities.MessageTypes.Select(id =>
+            new PluginCapabilityInfo(id, null, null)));
+
+        return capabilities
+            .DistinctBy(capability => $"{capability.Id}@{capability.Version}@{capability.AssemblyName}")
+            .ToArray();
     }
 
     private static IReadOnlyList<PluginPackageSourceInfo> BuildPackageSources(AirAppMarketPluginEntry entry)

LanMountainDesktop/plugins/AirAppMarketMetadataResolverService.cs

@@ -112,6 +112,9 @@ internal sealed class AirAppMarketMetadataResolverService : IDisposable
             ? entry.PackageSources
             : entry.Publication?.PackageSources ?? [];
         var firstPackageSourceUrl = resolvedPackageSources.FirstOrDefault()?.Url ?? entry.DownloadUrl;
+        var existingManifest = entry.Manifest;
+        var existingCompatibility = entry.Compatibility;
+        var existingPublication = entry.Publication;
 
         return new AirAppMarketPluginEntry
         {
@@ -142,9 +145,13 @@ internal sealed class AirAppMarketMetadataResolverService : IDisposable
                 {
                     MinHostVersion = FirstNonEmpty(
                         template?.MinHostVersion,
+                        existingCompatibility?.MinHostVersion,
                         entry.MinHostVersion),
                     PluginApiVersion = FirstNonEmpty(
                         resolvedManifest?.ApiVersion,
+                        existingCompatibility?.PluginApiVersion,
+                        existingCompatibility?.ApiVersion,
+                        existingManifest?.ApiVersion,
                         entry.ApiVersion)
                         ?? string.Empty
                 }
@@ -162,19 +169,24 @@ internal sealed class AirAppMarketMetadataResolverService : IDisposable
             },
             Publication = entry.Publication,
             Capabilities = entry.Capabilities,
-            Id = FirstNonEmpty(resolvedManifest?.Id, entry.Id, entry.PluginId) ?? entry.PluginId,
-            Name = FirstNonEmpty(resolvedManifest?.Name, entry.Name) ?? string.Empty,
-            Description = FirstNonEmpty(resolvedManifest?.Description, entry.Description) ?? string.Empty,
-            Author = FirstNonEmpty(resolvedManifest?.Author, entry.Author) ?? string.Empty,
-            Version = FirstNonEmpty(resolvedManifest?.Version, entry.Version) ?? string.Empty,
-            ApiVersion = FirstNonEmpty(resolvedManifest?.ApiVersion, entry.ApiVersion) ?? string.Empty,
-            MinHostVersion = FirstNonEmpty(template?.MinHostVersion, entry.MinHostVersion) ?? string.Empty,
+            Id = FirstNonEmpty(resolvedManifest?.Id, existingManifest?.Id, entry.Id, entry.PluginId) ?? entry.PluginId,
+            Name = FirstNonEmpty(resolvedManifest?.Name, existingManifest?.Name, entry.Name) ?? string.Empty,
+            Description = FirstNonEmpty(resolvedManifest?.Description, existingManifest?.Description, entry.Description) ?? string.Empty,
+            Author = FirstNonEmpty(resolvedManifest?.Author, existingManifest?.Author, entry.Author) ?? string.Empty,
+            Version = FirstNonEmpty(resolvedManifest?.Version, existingManifest?.Version, entry.Version) ?? string.Empty,
+            ApiVersion = FirstNonEmpty(
+                resolvedManifest?.ApiVersion,
+                existingCompatibility?.PluginApiVersion,
+                existingCompatibility?.ApiVersion,
+                existingManifest?.ApiVersion,
+                entry.ApiVersion) ?? string.Empty,
+            MinHostVersion = FirstNonEmpty(template?.MinHostVersion, existingCompatibility?.MinHostVersion, entry.MinHostVersion) ?? string.Empty,
             DownloadUrl = FirstNonEmpty(firstPackageSourceUrl, entry.DownloadUrl) ?? string.Empty,
-            Sha256 = entry.Sha256,
-            PackageSizeBytes = entry.PackageSizeBytes,
+            Sha256 = FirstNonEmpty(existingPublication?.Sha256, entry.Sha256) ?? string.Empty,
+            PackageSizeBytes = existingPublication?.PackageSizeBytes > 0 ? existingPublication.PackageSizeBytes : entry.PackageSizeBytes,
             IconUrl = FirstNonEmpty(template?.IconUrl, repository.IconUrl, entry.IconUrl) ?? string.Empty,
-            ReleaseTag = entry.ReleaseTag,
-            ReleaseAssetName = entry.ReleaseAssetName,
+            ReleaseTag = FirstNonEmpty(existingPublication?.ReleaseTag, entry.ReleaseTag) ?? string.Empty,
+            ReleaseAssetName = FirstNonEmpty(existingPublication?.ReleaseAssetName, entry.ReleaseAssetName) ?? string.Empty,
             ProjectUrl = FirstNonEmpty(template?.ProjectUrl, repository.ProjectUrl, entry.ProjectUrl) ?? string.Empty,
             ReadmeUrl = FirstNonEmpty(template?.ReadmeUrl, repository.ReadmeUrl, entry.ReadmeUrl) ?? string.Empty,
             HomepageUrl = FirstNonEmpty(template?.HomepageUrl, repository.HomepageUrl, entry.HomepageUrl) ?? string.Empty,
@@ -191,9 +203,9 @@ internal sealed class AirAppMarketMetadataResolverService : IDisposable
                 .ToList()
                 ?? entry.SharedContracts,
             PackageSources = resolvedPackageSources,
-            Md5 = entry.Md5,
-            PublishedAt = entry.PublishedAt,
-            UpdatedAt = entry.UpdatedAt,
+            Md5 = FirstNonEmpty(existingPublication?.Md5, entry.Md5) ?? string.Empty,
+            PublishedAt = existingPublication?.PublishedAt ?? entry.PublishedAt,
+            UpdatedAt = existingPublication?.UpdatedAt ?? entry.UpdatedAt,
             ReleaseNotes = FirstNonEmpty(template?.ReleaseNotes, repository.ReleaseNotes, entry.ReleaseNotes) ?? string.Empty
         };
     }

LanMountainDesktop/plugins/PluginMarketInstallService.cs

@@ -366,7 +366,17 @@ internal sealed class AirAppMarketInstallService : IDisposable
 
     private static string ResolveLauncherPath()
     {
-        return Path.Combine(AppContext.BaseDirectory, "Launcher", LauncherExecutableName);
+        var baseDirectory = AppContext.BaseDirectory;
+        var candidates = new[]
+        {
+            Path.Combine(baseDirectory, "Launcher", LauncherExecutableName),
+            Path.Combine(baseDirectory, LauncherExecutableName),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "LanMountainDesktop.Launcher", LauncherExecutableName)),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "..", "..", "..", "LanMountainDesktop.Launcher", "bin", "Debug", "net10.0", LauncherExecutableName)),
+            Path.GetFullPath(Path.Combine(baseDirectory, "..", "..", "..", "..", "LanMountainDesktop.Launcher", "bin", "Release", "net10.0", LauncherExecutableName))
+        };
+
+        return candidates.FirstOrDefault(File.Exists) ?? candidates[0];
     }
 
     private static void TryDeleteFile(string path)

LanMountainDesktop/plugins/PluginMarketModels.cs

@@ -646,6 +646,8 @@ internal sealed class AirAppMarketPluginCompatibilityEntry
 {
     public string MinHostVersion { get; init; } = string.Empty;
 
+    public string ApiVersion { get; init; } = string.Empty;
+
     public string PluginApiVersion { get; init; } = string.Empty;
 
     public AirAppMarketPluginCompatibilityEntry ValidateAndNormalize(string sourceName)
@@ -656,9 +658,13 @@ internal sealed class AirAppMarketPluginCompatibilityEntry
                 MinHostVersion,
                 nameof(MinHostVersion),
                 sourceName),
+            ApiVersion = AirAppMarketIndexDocument.NormalizeVersion(
+                AirAppMarketIndexDocument.NormalizeValue(PluginApiVersion) ?? ApiVersion,
+                nameof(ApiVersion),
+                sourceName),
             PluginApiVersion = AirAppMarketIndexDocument.NormalizeVersion(
-                PluginApiVersion,
-                nameof(PluginApiVersion),
+                AirAppMarketIndexDocument.NormalizeValue(PluginApiVersion) ?? ApiVersion,
+                nameof(ApiVersion),
                 sourceName)
         };
     }
@@ -742,6 +748,8 @@ internal sealed class AirAppMarketPluginPackageSourceEntry
 
     public string Url { get; init; } = string.Empty;
 
+    public string Path { get; init; } = string.Empty;
+
     public PluginPackageSourceKind SourceKind { get; init; } = PluginPackageSourceKind.ReleaseAsset;
 
     public AirAppMarketPluginPackageSourceEntry ValidateAndNormalize(string sourceName, string pluginId)
@@ -755,9 +763,11 @@ internal sealed class AirAppMarketPluginPackageSourceEntry
                 $"Market index '{sourceName}' declares invalid package source kind '{normalizedKind}' for plugin '{pluginId}'.");
         }
 
+        var normalizedPath = AirAppMarketIndexDocument.NormalizeValue(Path);
         var normalizedUrl = AirAppMarketIndexDocument.NormalizeValue(Url)
+            ?? normalizedPath
             ?? throw new InvalidOperationException(
-                $"Market index '{sourceName}' is missing package source url for plugin '{pluginId}'.");
+                $"Market index '{sourceName}' is missing package source url/path for plugin '{pluginId}'.");
         EnsurePackageSourceUrl(normalizedUrl, sourceName, pluginId);
 
         return new AirAppMarketPluginPackageSourceEntry
@@ -770,6 +780,7 @@ internal sealed class AirAppMarketPluginPackageSourceEntry
                 _ => normalizedKind
             },
             Url = normalizedUrl,
+            Path = normalizedPath ?? string.Empty,
             SourceKind = sourceKind
         };
     }
@@ -1240,6 +1251,7 @@ internal sealed class AirAppMarketPluginEntry
     {
         return compatibility is not null &&
                (!string.IsNullOrWhiteSpace(compatibility.MinHostVersion) ||
+                !string.IsNullOrWhiteSpace(compatibility.ApiVersion) ||
                 !string.IsNullOrWhiteSpace(compatibility.PluginApiVersion));
     }