style: 整理代码导入顺序并修复换行问题

1. 移除未使用的io导入和多余空行
2. 调整多个文件的fastapi导入模块顺序
3. 统一fastapi_cache导入位置
4. 修复middlewares文件末尾缺失的换行

backend/app/api/v1/module_system/role/controller.py

@@ -2,14 +2,14 @@ from typing import Annotated
 
 from fastapi import APIRouter, Body, Depends, Path, Query
 from fastapi.responses import JSONResponse, StreamingResponse
+from fastapi_cache import FastAPICache
+from fastapi_cache.decorator import cache
 
 from app.common.response import ResponseSchema, StreamResponse, SuccessResponse
 from app.core.base_params import PaginationQueryParam
 from app.core.base_schema import AuthSchema, BatchSetAvailable, PageResultSchema
 from app.core.dependencies import AuthPermission
 from app.core.router_class import OperationLogRoute
-from fastapi_cache import FastAPICache
-from fastapi_cache.decorator import cache
 from app.utils.common_util import bytes2file_response
 
 from .schema import (