refactor: 移除 retry_handler 中未使用的 KeyManager 导入

app/services/chat/response_handler.py

@@ -232,7 +232,9 @@ def _extract_text(response: Dict[str, Any], model: str, stream: bool = False) ->
                     else:
                         text = candidate["content"]["parts"][0]["text"]
             else:
-                text = candidate["content"]["parts"][0]["text"]
+                text = ""
+                for part in candidate["content"]["parts"]:
+                    text += part["text"]
             text = _add_search_link_text(model, candidate, text)
         else:
             text = "暂无返回"

app/services/chat/retry_handler.py

@@ -3,7 +3,6 @@
 from typing import TypeVar, Callable
 from functools import wraps
 from app.core.logger import get_retry_logger
-from app.services.key_manager import KeyManager
 
 T = TypeVar('T')
 logger = get_retry_logger()