refactor: 更新API路由参数解析，使用Body获取请求数据，简化请求处理逻辑

workflow_service/routes/run.py

@@ -1,7 +1,8 @@
 import json
-from typing import Optional
+from typing import Dict, Optional
 
-from fastapi import APIRouter, HTTPException, Request
+from fastapi import APIRouter, Body, HTTPException, Request
+from fastapi.openapi.models import RequestBody
 from fastapi.responses import JSONResponse
 
 from workflow_service import comfyui_client, database
@@ -14,15 +15,15 @@ run_router = APIRouter(
 
 @run_router.post("")
 async def run_workflow(
-    request: Request, workflow_name: str, workflow_version: Optional[str] = None
+    workflow_name: str,
+    workflow_version: Optional[str] = None,
+    data: Dict = Body(...),
 ):
     """
     异步执行工作流。
     立即返回任务ID，调用者可以通过任务ID查询执行状态。
     """
     try:
-        data = await request.json()
-
         if not workflow_name:
             raise HTTPException(status_code=400, detail="`workflow_name` 字段是必需的")