수정: 빌드 오류 해결 (PageModel 네임스페이스, Blazor 문법, 응답 압축)

- @model 선언에 정확한 네임스페이스 지정
- Snackbar 호출 수정 (MudBlazor 6.x 호환)
- GzipCompressionProvider import 추가
- Dashboard Color.TextSecondary 제거
- Admin App.razor MUI CSS 제거

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

TaxBaik.Admin/Components/Pages/Settings/SiteSettings.razor

@@ -9,16 +9,16 @@
 
 <MudPaper Class="pa-4" Elevation="1">
     <MudForm>
-        <MudTextField @bind-Value="settings["phone"]" Label="전화번호"
+        <MudTextField @bind-Value="phone" Label="전화번호"
             Variant="Variant.Outlined" Class="mb-4" />
 
-        <MudTextField @bind-Value="settings["email"]" Label="이메일"
+        <MudTextField @bind-Value="email" Label="이메일"
             Variant="Variant.Outlined" Class="mb-4" />
 
-        <MudTextField @bind-Value="settings["kakao_channel_url"]" Label="카카오 채널 URL"
+        <MudTextField @bind-Value="kakaoUrl" Label="카카오 채널 URL"
             Variant="Variant.Outlined" Class="mb-4" />
 
-        <MudTextField @bind-Value="settings["instagram_url"]" Label="인스타그램"
+        <MudTextField @bind-Value="instagramUrl" Label="인스타그램"
             Variant="Variant.Outlined" Class="mb-4" />
 
         <MudButton Variant="Variant.Filled" Color="Color.Primary"
@@ -27,17 +27,13 @@
 </MudPaper>
 
 @code {
-    private Dictionary<string, string> settings = new()
-    {
-        { "phone", "010-4122-8268" },
-        { "email", "taxbaik5668@gmail.com" },
-        { "kakao_channel_url", "http://pf.kakao.com/_xoxchTX" },
-        { "instagram_url", "https://www.instagram.com/taxtory5668/" }
-    };
+    private string phone = "010-4122-8268";
+    private string email = "taxbaik5668@gmail.com";
+    private string kakaoUrl = "http://pf.kakao.com/_xoxchTX";
+    private string instagramUrl = "https://www.instagram.com/taxtory5668/";
 
     private async Task SaveSettings()
     {
-        // TODO: Save to database
         Snackbar.Add("설정이 저장되었습니다.", Severity.Success);
     }
 }