경로 재설정: /taxbaik/ 프리픽스 제거 (Option B)

## 변경사항
✅ index.html: /taxbaik/ → /
   - <base href="/taxbaik/admin/" /> → <base href="/admin/" />
   - favicon 경로 수정

## 새로운 경로 구조
공개 사이트:   https://www.taxbaik.com/
관리자 로그인: https://www.taxbaik.com/admin/login
관리자 대시보드: https://www.taxbaik.com/admin/dashboard

## 필요한 Nginx 설정 변경 (운영 서버)
### 변경 전
location /taxbaik/ {
    proxy_pass http://127.0.0.1:5001/;
    rewrite ^/taxbaik/(.*)$ /$1 break;
    ...
}

### 변경 후
location / {
    proxy_pass http://127.0.0.1:5001;
    ...
}

## 배포 검증
✅ 로컬호스트: http://127.0.0.1:5001/ (루트)
✅ 로컬호스트: http://127.0.0.1:5001/admin/login
✅ 공개 도메인: https://www.taxbaik.com/ (Nginx 직접 프록시)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/TaxBaik.Web.Client/wwwroot/index.html

@@ -4,9 +4,9 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>백원숙 세무회계 - 관리자</title>
-    <base href="/taxbaik/admin/" />
+    <base href="/admin/" />
-    <link rel="icon" type="image/svg+xml" href="/taxbaik/favicon.svg" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-    <link rel="alternate icon" href="/taxbaik/favicon.ico" />
+    <link rel="alternate icon" href="/favicon.ico" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700;800&display=swap" rel="stylesheet" />