Refactor launcher startup, logging & host resolution

Improve launcher startup flow, logging, and host resolution. Key changes: add detailed startup logging and standardized preview messages; unify CLI vs GUI handling and error/result reporting (write result file when requested); refactor DeploymentLocator to a more robust host resolution (new HostResolutionResult, explicit/portable/published/debug resolution paths, legacy fallback); overhaul LauncherFlowCoordinator to better handle IPC stages, activation retries, window lifecycle, plugin/update flows and error reporting; add CommandContext helpers (IsGui/IsPreview/ExplicitAppRoot) and JSON context options; tighten async usage and ConfigureAwait calls; add better UI error handling and consistent exit codes. Several UX/debug conveniences and robustness fixes included.

LanMountainDesktop.Shared.Contracts/Launcher/LauncherIpc.cs

@@ -1,89 +1,38 @@
 namespace LanMountainDesktop.Shared.Contracts.Launcher;
 
-/// <summary>
-/// 启动阶段枚举
-/// </summary>
 public enum StartupStage
 {
-    /// <summary>
-    /// 初始化中
-    /// </summary>
     Initializing,
-    
-    /// <summary>
-    /// 加载设置中
-    /// </summary>
     LoadingSettings,
-    
-    /// <summary>
-    /// 加载插件中
-    /// </summary>
     LoadingPlugins,
-    
-    /// <summary>
-    /// 初始化界面中
-    /// </summary>
     InitializingUI,
-    
-    /// <summary>
-    /// 就绪
-    /// </summary>
+    ShellInitialized,
+    DesktopVisible,
+    ActivationRedirected,
+    ActivationFailed,
     Ready
 }
 
-/// <summary>
-/// 启动进度消息
-/// </summary>
 public record StartupProgressMessage
 {
-    /// <summary>
-    /// 当前阶段
-    /// </summary>
     public StartupStage Stage { get; init; }
-    
-    /// <summary>
-    /// 进度百分比 (0-100)
-    /// </summary>
+
     public int ProgressPercent { get; init; }
-    
-    /// <summary>
-    /// 状态消息
-    /// </summary>
+
     public string? Message { get; init; }
-    
-    /// <summary>
-    /// 时间戳
-    /// </summary>
+
     public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
 }
 
-/// <summary>
-/// Launcher IPC 常量
-/// </summary>
 public static class LauncherIpcConstants
 {
-    /// <summary>
-    /// 命名管道名称
-    /// </summary>
     public const string PipeName = "LanMountainDesktop_Launcher";
-    
-    /// <summary>
-    /// Launcher 进程 ID 环境变量
-    /// </summary>
+
     public const string LauncherPidEnvVar = "LMD_LAUNCHER_PID";
-    
-    /// <summary>
-    /// 包根目录环境变量
-    /// </summary>
+
     public const string PackageRootEnvVar = "LMD_PACKAGE_ROOT";
-    
-    /// <summary>
-    /// 版本环境变量
-    /// </summary>
+
     public const string VersionEnvVar = "LMD_VERSION";
-    
-    /// <summary>
-    /// 开发代号环境变量
-    /// </summary>
+
     public const string CodenameEnvVar = "LMD_CODENAME";
 }