refactor(launcher): reorganize into responsibility folders

Co-authored-by: Cursor <cursoragent@cursor.com>

LanMountainDesktop.Launcher/Oobe/LauncherWindowsStartupService.cs

@@ -0,0 +1,82 @@
+using System;
+using Microsoft.Win32;
+
+namespace LanMountainDesktop.Launcher.Oobe;
+
+/// <summary>
+/// 将当前 Windows 用户登录时自启动项指向<strong>本 Launcher 进程</strong>（与正式入口一致）。
+/// Host 内 WindowsStartupService 使用 Host 进程路径；
+/// OOBE 在 Launcher 内执行时应使用本类型，以便开机后仍走更新/版本协调流程。
+/// </summary>
+public sealed class LauncherWindowsStartupService
+{
+    private const string RunKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Run";
+    private const string ValueName = "LanMountainDesktop";
+    private readonly string _startupCommand;
+
+    public LauncherWindowsStartupService()
+    {
+        var processPath = Environment.ProcessPath;
+        _startupCommand = string.IsNullOrWhiteSpace(processPath)
+            ? string.Empty
+            : $"\"{processPath}\"";
+    }
+
+    public bool IsEnabled()
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return false;
+        }
+
+        try
+        {
+            using var runKey = Registry.CurrentUser.OpenSubKey(RunKeyPath, writable: false);
+            return runKey?.GetValue(ValueName) is string value &&
+                   !string.IsNullOrWhiteSpace(value);
+        }
+        catch (Exception ex)
+        {
+            Logger.Warn($"LauncherWindowsStartup: failed to read Run key. {ex.Message}");
+            return false;
+        }
+    }
+
+    public bool SetEnabled(bool enabled)
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return false;
+        }
+
+        if (enabled && string.IsNullOrWhiteSpace(_startupCommand))
+        {
+            return false;
+        }
+
+        try
+        {
+            using var runKey = Registry.CurrentUser.CreateSubKey(RunKeyPath);
+            if (runKey is null)
+            {
+                return false;
+            }
+
+            if (enabled)
+            {
+                runKey.SetValue(ValueName, _startupCommand, RegistryValueKind.String);
+            }
+            else
+            {
+                runKey.DeleteValue(ValueName, throwOnMissingValue: false);
+            }
+
+            return IsEnabled() == enabled;
+        }
+        catch (Exception ex)
+        {
+            Logger.Warn($"LauncherWindowsStartup: failed to set Run key. Enabled={enabled}. {ex.Message}");
+            return false;
+        }
+    }
+}