refactor: 替换 asyncio.get_event_loop 为 get_running_loop 并优化会话卡片

- 将多处 asyncio.get_event_loop() 替换为更安全的 asyncio.get_running_loop()
- 重构 Feishu 卡片功能，新增 build_sessions_card 方法显示所有会话
- 优化文件路径处理逻辑，支持绝对路径和相对路径
- 在健康检查接口中添加 pending_requests 计数
- 更新会话状态命令以支持卡片显示

router/main.py

@@ -43,6 +43,7 @@ def create_app(router_secret: Optional[str] = None) -> FastAPI:
 
     @app.get("/health")
     async def health():
+        from router.rpc import get_pending_count
         nodes = registry.list_nodes()
         online_nodes = [n for n in nodes if n["status"] == "online"]
         return {
@@ -50,7 +51,7 @@ def create_app(router_secret: Optional[str] = None) -> FastAPI:
             "nodes": nodes,
             "online_nodes": len(online_nodes),
             "total_nodes": len(nodes),
-            "pending_requests": 0,
+            "pending_requests": get_pending_count(),
         }
 
     @app.get("/nodes")
@@ -64,7 +65,7 @@ def create_app(router_secret: Optional[str] = None) -> FastAPI:
     @app.on_event("startup")
     async def startup():
         import asyncio
-        loop = asyncio.get_event_loop()
+        loop = asyncio.get_running_loop()
         start_websocket_client(loop)
         logger.info("Router started")
 

router/rpc.py

@@ -52,7 +52,7 @@ async def forward(
         raise RuntimeError(f"Node not connected: {node_id}")
 
     request_id = str(uuid.uuid4())
-    future: asyncio.Future[str] = asyncio.get_event_loop().create_future()
+    future: asyncio.Future[str] = asyncio.get_running_loop().create_future()
     _pending_requests[request_id] = future
 
     request = ForwardRequest(