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_ws.py

@@ -14,7 +14,7 @@ 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"
 RESULTS = []
 
 def log(tag, msg):