refactor: reorganize backend module boundaries

app/agent/llm/provider.py

@@ -20,9 +20,9 @@ import aiofiles
 import httpx
 import jwt
 
-from app.platform.config import settings
+from app.runtime.config import settings
 from app.db.systemconfig_oper import SystemConfigOper
-from app.platform.log import logger
+from app.runtime.log import logger
 from app.schemas.types import SystemConfigKey
 from app.foundation.singleton import Singleton