增加外部接口调用开关

app/config.py

@@ -13,6 +13,7 @@ class Settings(BaseSettings):
     
     # 业务配置
     count_threshold: int = 3  # count阈值，大于等于此值直接返回
+    external_api_enabled: bool = False  # 是否启用外部API调用
     external_api_retry_max: int = 3  # 外部API最大重试次数
     external_api_url: str = ""
     
@@ -26,6 +27,7 @@ class Settings(BaseSettings):
     
     # 应用配置
     app_name: str = "AI Talk Callback API"
+    environment: str = "production"  # 环境: production, test, development
     debug: bool = False
     
     class Config: