feat: 初始提交

backend/app/repositories/llm_config_repository.py

@@ -0,0 +1,14 @@
+from typing import Optional
+
+from sqlalchemy import select
+
+from .base import BaseRepository
+from ..models import LLMConfig
+
+
+class LLMConfigRepository(BaseRepository[LLMConfig]):
+    model = LLMConfig
+
+    async def get_by_user(self, user_id: int) -> Optional[LLMConfig]:
+        result = await self.session.execute(select(LLMConfig).where(LLMConfig.user_id == user_id))
+        return result.scalars().first()