Update project 3 iteration feat: core booking pipeline, webhook and async pdf worker CORE COPLETE

backend/main.py

@@ -6,10 +6,12 @@ from database.session import get_db
 from database.models import Ticket, TicketStatus
 from core.redis import acquire_seat_lock, release_seat_lock
 from api.routers.auth import router as auth_router
+from api.routers.webhooks import router as webhooks_router
 
 app = FastAPI(title="Ticketing System API")
 
 app.include_router(auth_router)
+app.include_router(webhooks_router)
 
 @app.post("/api/seats/{seat_id}/lock", status_code=status.HTTP_200_OK)
 async def lock_seat(seat_id: int, user_id: int, db: AsyncSession = Depends(get_db)):