修复缺少safe_decode_json

PyServer/main.py

@@ -48,6 +48,18 @@ class Room:
             'created_at': self.created_at.isoformat()
         }
 
+def safe_decode_json(raw_body: bytes) -> Dict[Any, Any]:
+    """
+    尝试用 UTF-8 解码，失败则尝试 GB18030（兼容 GBK/GB2312）
+    """
+    for encoding in ['utf-8', 'gb18030', 'latin1']:
+        try:
+            text = raw_body.decode(encoding)
+            return json.loads(text)
+        except (UnicodeDecodeError, json.JSONDecodeError):
+            continue
+    raise ValueError("无法解码请求体为有效 JSON")
+
 def get_frontend_to_client_queue(room_id: str) -> List[Dict[str, Any]]:
     if room_id not in frontend_to_client_queues:
         frontend_to_client_queues[room_id] = []