refactor: organize imports and enhance formatting across backend files

Optimized import order, applied consistent formatting, and improved readability in various modules, including `contents`, `media`, and `auth` services.

backend/src/auth/auth.controller.ts

@@ -4,7 +4,6 @@ import type { Request, Response } from "express";
 import { getIronSession } from "iron-session";
 import { AuthService } from "./auth.service";
 import { LoginDto } from "./dto/login.dto";
-import { RefreshDto } from "./dto/refresh.dto";
 import { RegisterDto } from "./dto/register.dto";
 import { Verify2faDto } from "./dto/verify-2fa.dto";
 import { getSessionOptions, SessionData } from "./session.config";