fix: 调整 chat WS/WT dev 接入

WT 目前沿用 JToken 的 JWT 校验；撤销一致性留到后续 WT 专用网关设计。

app/chat/test/test_wt.py

@@ -5,8 +5,6 @@ import asyncio
 import json
 import sys
 import time
-import urllib.request
-import urllib.error
 
 try:
     import websockets
@@ -15,7 +13,7 @@ except ImportError:
     subprocess.check_call([sys.executable, "-m", "pip", "install", "websockets", "-q"])
     import websockets
 
-WS_URL = "ws://localhost:28889/ws/chat"
+WS_URL = "ws://localhost:28888/ws/chat"
 API_BASE = "http://localhost:28888"
 RESULTS = []