费用管理内容优化-初步

backend/app/main.py

@@ -10,6 +10,7 @@ from app.core.exceptions import register_exception_handlers
 from app.crud.user import ensure_admin_exists
 from app.db.base import Base
 from app.db.session import SessionLocal, engine
+from app.services.fee_seed import seed_demo_fees
 
 
 @asynccontextmanager
@@ -23,6 +24,7 @@ async def lifespan(_: FastAPI):
             await conn.run_sync(Base.metadata.create_all)
         async with SessionLocal() as session:
             await ensure_admin_exists(session)
+            await seed_demo_fees(session)
     yield