feat: 시즌별 마케팅 + 공지사항 관리 기능 추가

- 연간 세무 캘린더(7개 시즌) 기반 자동 Hero 섹션 전환
- 시즌 감지 시 D-Day 카운트다운, 긴박감 배지, 시즌 CTA 표시
- 서비스 카드 순서 시즌 관련 항목 우선 정렬
- 어드민 공지사항 CRUD (등록·수정·삭제, 기간·유형 설정)
- 홈페이지 상단 공지 배너 자동 노출 (일반/배너/긴급)
- CLAUDE.md에 세무 캘린더 및 마케팅 방향 하네스 추가

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

TaxBaik.Web/Components/Admin/Pages/Dashboard.razor

@@ -5,41 +5,60 @@
 
 <PageTitle>대시보드</PageTitle>
 
-<h1 class="mb-4">대시보드</h1>
+<section class="admin-page-hero">
+    <div>
+        <MudText Typo="Typo.caption" Class="admin-eyebrow">Overview</MudText>
+        <MudText Typo="Typo.h4" Class="admin-page-title">대시보드</MudText>
+        <MudText Typo="Typo.body2" Class="admin-page-subtitle">문의 흐름과 콘텐츠 상태를 한 화면에서 확인합니다.</MudText>
+    </div>
+    <MudButton Variant="Variant.Filled" Color="Color.Primary" StartIcon="@Icons.Material.Filled.Add" Href="/taxbaik/admin/blog/create">
+        새 포스트 작성
+    </MudButton>
+</section>
 
-<MudGrid>
+<MudGrid Class="admin-metric-grid">
     <MudItem xs="12" sm="6" md="3">
-        <MudPaper Class="pa-4" Elevation="1">
-            <MudText Typo="Typo.subtitle2">이번달 문의</MudText>
-            <MudText Typo="Typo.h4">@summary.ThisMonthInquiries</MudText>
+        <MudPaper Class="admin-metric-card accent-blue" Elevation="0">
+            <MudText Typo="Typo.caption">이번달 문의</MudText>
+            <MudText Typo="Typo.h3">@summary.ThisMonthInquiries</MudText>
+            <MudText Typo="Typo.body2">월간 상담 유입</MudText>
         </MudPaper>
     </MudItem>
 
     <MudItem xs="12" sm="6" md="3">
-        <MudPaper Class="pa-4" Elevation="1">
-            <MudText Typo="Typo.subtitle2">신규 문의</MudText>
-            <MudText Typo="Typo.h4">@summary.NewInquiries</MudText>
+        <MudPaper Class="admin-metric-card accent-amber" Elevation="0">
+            <MudText Typo="Typo.caption">신규 문의</MudText>
+            <MudText Typo="Typo.h3">@summary.NewInquiries</MudText>
+            <MudText Typo="Typo.body2">처리 대기</MudText>
         </MudPaper>
     </MudItem>
 
     <MudItem xs="12" sm="6" md="3">
-        <MudPaper Class="pa-4" Elevation="1">
-            <MudText Typo="Typo.subtitle2">전체 포스트</MudText>
-            <MudText Typo="Typo.h4">@summary.TotalPosts</MudText>
+        <MudPaper Class="admin-metric-card accent-slate" Elevation="0">
+            <MudText Typo="Typo.caption">전체 포스트</MudText>
+            <MudText Typo="Typo.h3">@summary.TotalPosts</MudText>
+            <MudText Typo="Typo.body2">콘텐츠 자산</MudText>
         </MudPaper>
     </MudItem>
 
     <MudItem xs="12" sm="6" md="3">
-        <MudPaper Class="pa-4" Elevation="1">
-            <MudText Typo="Typo.subtitle2">발행된 포스트</MudText>
-            <MudText Typo="Typo.h4">@summary.PublishedPosts</MudText>
+        <MudPaper Class="admin-metric-card accent-green" Elevation="0">
+            <MudText Typo="Typo.caption">발행된 포스트</MudText>
+            <MudText Typo="Typo.h3">@summary.PublishedPosts</MudText>
+            <MudText Typo="Typo.body2">검색 노출 대상</MudText>
         </MudPaper>
     </MudItem>
 </MudGrid>
 
-<MudPaper Class="pa-4 mt-4" Elevation="1">
-    <MudText Typo="Typo.h6" Class="mb-3">최근 문의</MudText>
-    <MudSimpleTable Striped="true" Dense="true">
+<MudPaper Class="admin-surface mt-4" Elevation="0">
+    <div class="admin-section-header">
+        <div>
+            <MudText Typo="Typo.h6">최근 문의</MudText>
+            <MudText Typo="Typo.body2">최근 유입된 상담 요청을 빠르게 확인합니다.</MudText>
+        </div>
+        <MudButton Variant="Variant.Outlined" Color="Color.Primary" Href="/taxbaik/admin/inquiries">문의 전체 보기</MudButton>
+    </div>
+    <MudSimpleTable Striped="true" Dense="true" Class="admin-table">
         <thead>
             <tr>
                 <th>이름</th>
@@ -59,7 +78,7 @@
                     <td>
                         <MudChip Size="Size.Small"
                             Color="@(inquiry.Status == "new" ? Color.Warning : inquiry.Status == "contacted" ? Color.Info : Color.Success)">
-                            @inquiry.Status
+                            @GetStatusLabel(inquiry.Status)
                         </MudChip>
                     </td>
                     <td>@inquiry.CreatedAt.ToString("yyyy-MM-dd")</td>
@@ -75,5 +94,13 @@
     protected override async Task OnInitializedAsync()
     {
         summary = await DashboardService.GetSummaryAsync();
-    }
+}
+
+    private static string GetStatusLabel(string status) => status switch
+    {
+        "new" => "신규",
+        "contacted" => "연락함",
+        "completed" => "완료",
+        _ => status
+    };
 }