fix: import AsyncResult directly so test patches on app.api.routes.AsyncResult resolve

app/api/routes.py

@@ -9,7 +9,6 @@ from app.core.metrics import metrics
 from app.models.report import EngineeringReport
 from app.models.repository import RepositoryRequest, RepositoryResponse
 from app.models.job import JobStatus, JobStatusResponse, JobSubmitResponse
-from app.worker.celery_app import celery_app
 from app.worker.tasks import analyze_repository_task
 from app.services.analysis_service import run_full_analysis
 from app.agents import repo_analysis_agent