对齐三端桥接层结构

拆分移动壳 HostBridge 协议、文件和分享模块

更新原生壳结构门禁和移动壳配置检查

同步宿主壳架构文档和共享决策记录

scripts/check-native-shells.mjs

@@ -30,6 +30,9 @@ const expectedWechatShellFiles = [
 const expectedMobileHostBridgeFiles = [
   'mobileHostBridge.test.ts',
   'mobileHostBridge.ts',
+  'mobileHostBridgeFiles.ts',
+  'mobileHostBridgeProtocol.ts',
+  'mobileHostBridgeShare.ts',
 ];
 const expectedMobileShellFiles = [
   'mobileShellDeepLink.test.ts',