refactor: adjust imports and streamline code for consistency

- Reorganized import statements in multiple files for better readability.
- Refined `auth.service` to remove unused `email` variable in `login` function.
- Cleaned up whitespace and formatting in `http-exception.filter.spec.ts`.

backend/src/common/middlewares/crawler-detection.middleware.ts

@@ -1,7 +1,7 @@
+import { createHash } from "node:crypto";
 import { CACHE_MANAGER } from "@nestjs/cache-manager";
 import { Inject, Injectable, Logger, NestMiddleware } from "@nestjs/common";
 import type { Cache } from "cache-manager";
-import { createHash } from "node:crypto";
 import type { NextFunction, Request, Response } from "express";
 
 @Injectable()