style: Apply form compaction to Create/Edit pages

Standardize all Create and Edit forms with:
- card-body p-2 padding
- form-control-sm, form-select-sm, form-label-sm for compact layout
- btn-sm for buttons
- row g-2 spacing instead of g-3
- Consistent empty state and danger action styling

Affected pages: Clients, Announcements, FAQs, Inquiries, Blog

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

src/TaxBaik.Web/Pages/Admin/Blog/Create.cshtml

@@ -9,7 +9,7 @@
     @await Html.PartialAsync("_AdminPageHeader", new TaxBaik.Web.Models.AdminPageHeaderModel("콘텐츠", "새 글 작성", "블로그 글을 등록합니다.", null, null))
 
     <div class="card">
-        <div class="card-body">
+        <div class="card-body p-2">
             @await Html.PartialAsync("_BlogEditor", new TaxBaik.Web.Pages.Shared.BlogEditorModel(
                 Model.Input.Title,
                 Model.Input.Content,