style: apply ruff formatting to source and test files

app/main.py

@@ -1,7 +1,7 @@
 """Application entry point with DDD architecture."""
 
+from collections.abc import AsyncGenerator
 from contextlib import asynccontextmanager
-from typing import AsyncGenerator
 
 import uvicorn
 from dishka import make_async_container
@@ -21,7 +21,7 @@ from app.presentation import router
 
 
 @asynccontextmanager
-async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
+async def lifespan(app: FastAPI) -> AsyncGenerator[None]:
     """Application lifespan manager."""
     # Startup
     await init_db()