新增 Expo 与 Tauri 原生宿主壳

新增 HostBridge 原生宿主契约和 H5 native_app transport

新增 Expo React Native 移动壳并收紧 WebView 外链边界

新增 Tauri 桌面壳并用 capability 收口受控命令

更新宿主壳方案、文档索引和共享记忆

apps/desktop-shell/src-tauri/capabilities/main.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "main",
+  "description": "主窗口只开放 Genarrative 桌面宿主壳需要的受控命令。",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "allow-host-bridge-request"
+  ]
+}