增加celery任务队列，任务持久化（服务重启不丢）、支持多 Worker 水平扩展、失败自动重试

src/api/routes.py

@@ -1,5 +1,5 @@
 # api/routes.py
-from fastapi import APIRouter, UploadFile, File, HTTPException, BackgroundTasks, Request, Depends
+from fastapi import APIRouter, UploadFile, File, HTTPException, Request, Depends
 from typing import Optional, Dict, Any, List
 import uuid
 from datetime import datetime
@@ -10,8 +10,8 @@ from models.schemas import ProcessingStatus, create_task_info
 from utils.file_handler import FileHandler
 from services.storage_integration_rustfs import StorageIntegrationService
 from services.redis_task_manager import redis_task_manager
-from services.processing_service import processing_service
 from services.task_query_service import TaskQueryService
+from celery_tasks import process_stp_task
 from database.database import get_db_session
 from utils.logger import get_logger
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -54,7 +54,6 @@ async def health():
 
 @router.post("/upload")
 async def upload_stp(
-    background_tasks: BackgroundTasks, 
     file: UploadFile = File(...),
     material: Optional[str] = "ABS",
     db_session: AsyncSession = Depends(get_db_session),
@@ -104,13 +103,7 @@ async def upload_stp(
 
     # 后台处理走统一编排服务，避免请求会话在后台失效
     process_params = {"material": material}
-    background_tasks.add_task(
-        processing_service.process_file_with_storage,
-        task_id,
-        file_path,
-        stp_file.id,
-        process_params,
-    )
+    process_stp_task.delay(task_id, str(file_path), stp_file.id, process_params)
     logger.info(f"[UPLOAD] 后台处理已调度: task_id={task_id}")
 
     return {