feat(h5): web 联网能力、实时查询路由与 session Finish 对齐

- 新增 web 能力并挂载 platform/web（web_search/fetch_url）
- 实时查询强制 web skill，router fallback 与 await session Finish
- Session Broker 覆盖率/指标、stream replay 与相关单测/E2E 脚本

Co-authored-by: Cursor <cursoragent@cursor.com>

memory-v2-admin-config.mjs

@@ -207,9 +207,10 @@ function applyEnv(config, secrets, env = process.env) {
     config.chatIntentRouter.memoryResolveLimit = '8';
   }
   if (!normalizeString(config.chatIntentRouter.timeoutMs)) {
-    config.chatIntentRouter.timeoutMs = '1500';
+    config.chatIntentRouter.timeoutMs = '2500';
   }
-  if (!normalizeString(config.chatIntentRouter.fallbackRoute)) {
+  const fallbackRoute = normalizeString(config.chatIntentRouter.fallbackRoute);
+  if (!fallbackRoute || fallbackRoute === 'direct_chat') {
     config.chatIntentRouter.fallbackRoute = 'agent_orchestration';
   }
   return { config, secrets };