Use shared settings dependency in security helpers (#52)

Author: shayancoin

backend/api/security.py

@@ -10,17 +10,11 @@
 from fastapi.security import APIKeyHeader
 from starlette.status import HTTP_401_UNAUTHORIZED, HTTP_403_FORBIDDEN
 
-from api.config import Settings
+from api.config import Settings, get_settings
 
 # Write token (admin) auth
 api_key_header = APIKeyHeader(name="Authorization", auto_error=False)
 
-
-def get_settings() -> Settings:
-    # Instantiate settings outside of Pydantic request validation to avoid DI issues.
-    return Settings()
-
-
 async def require_write_token(
     authorization: str | None = Security(api_key_header),
     settings: Settings = Depends(get_settings),