fix: chat channel runtime (#16129)

### What problem does this PR solve?
Fix chat channel message routing to use the connected `chat_id`, and
make the Feishu websocket client bind to the thread-local event loop.

### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)

api/channels/feishu/channel.py

@@ -8,6 +8,7 @@ from dataclasses import dataclass
 from typing import Optional
 
 import lark_oapi as lark
+import lark_oapi.ws.client as lark_ws_client
 from lark_oapi.api.im.v1 import (
     CreateMessageRequest,
     CreateMessageRequestBody,
@@ -73,6 +74,11 @@ class FeishuChannel(Channel):
         # context: already entered"). A dedicated isolated loop avoids that.
         loop = asyncio.new_event_loop()
         asyncio.set_event_loop(loop)
+        # lark_oapi.ws.client stores a module-level `loop` at import time and all
+        # websocket task scheduling goes through that object. Rebind it here so
+        # this Feishu channel uses the thread-local loop instead of the API
+        # server's main loop.
+        lark_ws_client.loop = loop
         try:
             handler = (
                 lark.EventDispatcherHandler.builder("", "")