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.Web/Pages/Blog/Post.cshtml

@@ -1,10 +1,10 @@
 @page "{slug}"
-@model BlogPostModel
+@model TaxBaik.Web.Pages.Blog.BlogPostModel
 @{
     ViewData["Title"] = Model.Post?.SeoTitle ?? Model.Post?.Title;
     ViewData["Description"] = Model.Post?.SeoDescription ?? "";
     ViewData["OgImage"] = Model.Post?.ThumbnailUrl ?? "";
-    ViewData["CanonicalUrl"] = $"http://178.104.200.7/taxbaik/blog/{slug}";
+    ViewData["CanonicalUrl"] = $"http://178.104.200.7/taxbaik/blog/{Model.Post?.Slug ?? slug}";
 }
 
 @if (Model.Post != null)