新增业务原子化；新增fireccrawl的baseurl修改

backend/core/config.py

@@ -9,9 +9,11 @@ class Settings(BaseSettings):
     DB_PORT: str = "5432"
     DB_NAME: str
     DASHSCOPE_API_KEY: str
+    FIRECRAWL_API_KEY_EXSIST: bool = True # 是否存在API密钥
     FIRECRAWL_API_KEY: str
-    
-    CANDIDATE_NUM: int = 50 
+    FIRECRAWL_API_URL: str = "https://api.firecrawl.dev/" # 默认官方API
+
+    CANDIDATE_NUM: int = 50
 
     # =========================================================
     # 【核心修复】加上 ClassVar 类型注解