统一原生扫码超时契约

将二维码扫码超时提升到共享 HostBridge 契约

让 H5 facade 和测试复用共享扫码超时常量

增加原生壳门禁拦截扫码超时字面量回退

补充宿主壳方案文档和共享决策记录

scripts/check-native-shells.mjs

@@ -978,6 +978,7 @@ function assertH5HostBridgePayloadBoundaries() {
     'HOST_BRIDGE_AUDIO_MIME_TYPES',
     'HOST_BRIDGE_RUNTIME_REFRESH_TIMEOUT_MS',
     'HOST_BRIDGE_USER_INTERACTION_TIMEOUT_MS',
+    'HOST_BRIDGE_SCANNER_TIMEOUT_MS',
   ]) {
     if (!h5HostBridgeSource.includes(`${sharedBoundary},`)) {
       throw new Error(
@@ -1022,6 +1023,11 @@ function assertH5HostBridgePayloadBoundaries() {
       'H5 HostBridge facade must use shared HOST_BRIDGE_USER_INTERACTION_TIMEOUT_MS',
     );
   }
+  if (h5HostBridgeSource.includes('timeoutMs: 60000')) {
+    throw new Error(
+      'H5 HostBridge facade must use shared HOST_BRIDGE_SCANNER_TIMEOUT_MS',
+    );
+  }
 }
 
 function assertH5NativeAppTransportTimeoutBoundaries() {