style(login): 로그인 브랜드 아이콘 로고 교체

frontend/src/admin/AdminLogin.tsx

@@ -1,6 +1,5 @@
 import { useEffect, useState } from 'react'
 import { useNavigate } from 'react-router-dom'
-import { Flower2 } from 'lucide-react'
 import { useTranslation } from 'react-i18next'
 import { login, getMe } from '../api/client'
 import LanguageSwitcher from '../i18n/LanguageSwitcher'
@@ -40,7 +39,7 @@ export default function AdminLogin() {
       <div className="absolute top-5 right-5"><LanguageSwitcher variant="admin" /></div>
       <form onSubmit={submit} className="w-[360px] bg-panel border border-edge rounded-2xl p-8">
         <div className="flex items-center gap-2 justify-center mb-6">
-          <Flower2 className="text-brand" size={28} />
+          <img src="/login.png" alt="GUARDiA" style={{height:36,width:'auto'}} />
           <span className="text-xl font-bold">{t('admin.login.title')}</span>
         </div>
         <p className="text-center text-sm text-slate-400 mb-6">{t('admin.login.subtitle')}</p>