P1-2: 统一Dify调用点 - 删除detect-intent死链路(approval/byod) + routing_service共享client修复连接泄漏 + 前端死代码清理

backend/app/dependencies/__init__.py

@@ -215,6 +215,16 @@ async def cleanup_shared_services():
             logger.warning(f"AIService 连接池关闭异常: {e}")
         _shared_ai_handler = None
 
+    # v4.0 P1-2: 关闭 routing_service 的共享 httpx 连接池
+    try:
+        from app.services import routing_service
+        if routing_service._routing_client and not routing_service._routing_client.is_closed:
+            await routing_service._routing_client.aclose()
+            routing_service._routing_client = None
+            logger.info("routing_service httpx 连接池已关闭")
+    except Exception as e:
+        logger.warning(f"routing_service 连接池关闭异常: {e}")
+
 
 # Token 黑名单 Key 前缀（与 auth.py 中保持一致）
 TOKEN_BLACKLIST_PREFIX = "token:blacklist:"