feat.airapp与融合桌面

.trae/specs/launcher-managed-air-app-lifecycle/checklist.md

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+# Checklist
+
+- [x] `LanMountainDesktop.Shared.IPC` builds in Debug.
+- [x] `LanMountainDesktop.Launcher` builds in Debug.
+- [x] `LanMountainDesktop` builds in Debug.
+- [x] `LanMountainDesktop.AirAppHost` builds in Debug.
+- [x] `LanMountainDesktop.Tests` builds in Debug.
+- [x] Air APP launcher and lifecycle unit tests pass.
+- [x] Direct-host fallback starts Launcher in `air-app-broker` mode instead of debug/normal launch mode.
+- [ ] Manual process-lifetime verification with the running desktop.

.trae/specs/launcher-managed-air-app-lifecycle/spec.md

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+# Launcher Managed Air APP Lifecycle
+
+## Goal
+
+Make Launcher the authoritative lifecycle manager for built-in Air APP processes. The desktop host requests Air APP operations through IPC, while Launcher creates, activates, tracks, and cleans up Air APP host processes.
+
+## Behavior
+
+- Launcher exposes `IAirAppLifecycleService` on the dedicated `LanMountainDesktop.Launcher.AirApp.v1` pipe.
+- Desktop host calls Launcher IPC for `world-clock` and `whiteboard`; it does not directly start `LanMountainDesktop.AirAppHost`.
+- If the dedicated pipe is unavailable, the desktop host starts Launcher with the hidden `air-app-broker --requester-pid <pid>` command and retries the Air APP request.
+- `air-app-broker` starts only the Air APP lifecycle IPC broker. It bypasses OOBE, Splash, debug preview windows, and normal desktop launch orchestration.
+- Launcher keeps one Air APP process per `{appId}:{sourceComponentId}:{sourcePlacementId}` key.
+- AirAppHost receives Launcher pipe and instance key at startup, registers after the window opens, and unregisters on close.
+- Launcher remains alive while the main desktop process or any Air APP process is alive.
+- Broker mode remains alive while the requester desktop process or any Air APP process is alive; after both are gone, it exits.
+
+## Out of Scope
+
+- Third-party plugin-declared Air APP metadata.
+- Cross-machine IPC.
+- Persisting the Air APP instance table across OS reboot.

.trae/specs/launcher-managed-air-app-lifecycle/tasks.md

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+# Tasks
+
+- [x] Add shared Air APP lifecycle IPC contracts.
+- [x] Add Launcher Air APP lifecycle service and dedicated IPC host.
+- [x] Make Launcher remain alive while desktop or Air APP processes exist.
+- [x] Route desktop Air APP launch requests through Launcher IPC.
+- [x] Add hidden `air-app-broker` Launcher command for direct-host development fallback.
+- [x] Make desktop fallback start `air-app-broker --requester-pid <pid>` instead of normal `launch`.
+- [x] Add broker lifetime and command recognition tests.
+- [x] Add AirAppHost registration and unregister best-effort calls.
+- [x] Add lifecycle service and request-building tests.