Stamp release versions and harden launcher

Add automatic release version stamping and multiple launcher reliability improvements. The Release workflow now runs scripts/Set-ReleaseVersion.ps1 in build jobs to inject tag-derived Version/AssemblyVersion into project metadata; several .csproj/Directory.Build.props and app.manifest files were changed to use a dev placeholder. Introduced AppVersionProvider (and related runtime metadata) to centralize version resolution and updated DeploymentLocator to use it and to prefer package-root/version.json. Launcher startup flow was hardened: added startup success tracking, public-activation recovery path, improved success/fallback semantics, and related IPC handling. UI/UX fixes include OOBE entrance/exit animation improvements (scaling-aware, concurrent fade+translate) and minor window lifecycle reorder in DesktopShellHost. CommandContext now recognizes restart and key=value args. New DesktopTrayService and .trae spec files (spec, checklist, tasks) document shell/tray hardening work. Miscellaneous logging, comments and housekeeping edits across launcher and shared contracts to support the above.

.trae/specs/launcher-shell-hardening/checklist.md

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+# 验收清单
+
+- [ ] 设置页重启后，Launcher 能重新接管并恢复到正确展示形态。
+- [ ] 插件升级辅助程序完成后，回拉的是 Launcher 而不是宿主 exe。
+- [ ] 已在托盘中的实例再次启动时，不会出现第二个主进程。
+- [ ] 托盘初始化失败时，应用不会进入无入口的 `TrayOnly`。
+- [ ] 托盘运行中丢失时，watchdog 能重建或自动恢复前台。
+- [ ] Launcher UI 版本与应用设置页版本一致。
+- [ ] 发布 tag `vX.Y.Z.W` 时，manifest、程序集、`version.json`、安装包和资产命名一致。
+- [ ] 100% / 150% / 200% / 250% 缩放下，Launcher OOBE、主窗口、通知动画正常。