style(auth): 로그인 페이지 UI 조정

- 로고: WING → GC WING + demo 라벨
- 하단: GC Surveillance → GC SI Team

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/pages/login/LoginPage.tsx

@@ -37,7 +37,7 @@ export function LoginPage() {
   return (
     <div className="auth-page">
       <div className="auth-card">
-        <div className="auth-logo">WING</div>
+        <div className="auth-logo"><span style={{ position: 'relative' }}>GC WING<span style={{ position: 'absolute', right: -48, bottom: 0, color: '#F59E0B', fontSize: 12, fontWeight: 600 }}>demo</span></span></div>
         <div className="auth-title">조업감시 대시보드</div>
         <div className="auth-subtitle">@gcsc.co.kr 계정으로 로그인하세요</div>
 
@@ -62,7 +62,7 @@ export function LoginPage() {
         )}
 
         <div className="auth-footer">
-          GC Surveillance &middot; Wing Fleet Dashboard
+          GC SI Team &middot; Wing Fleet Dashboard
         </div>
       </div>
     </div>