feat(admin): stabilize blog and admin patterns

TaxBaik.Web/Components/Admin/Pages/Clients/ClientList.razor

@@ -9,18 +9,15 @@
 
 <PageTitle>고객 관리</PageTitle>
 
-<section class="admin-page-hero">
-    <div>
-        <MudText Typo="Typo.caption" Class="admin-eyebrow">CRM</MudText>
-        <MudText Typo="Typo.h4" Class="admin-page-title">고객 관리</MudText>
-        <MudText Typo="Typo.body2" Class="admin-page-subtitle">고객 카드를 등록하고 상담 이력을 관리합니다.</MudText>
-    </div>
-    <MudButton Variant="Variant.Filled" Color="Color.Primary"
-               StartIcon="@Icons.Material.Filled.PersonAdd"
-               Href="/taxbaik/admin/clients/create">
-        고객 등록
-    </MudButton>
-</section>
+<AdminPageHeader Title="고객 관리" Eyebrow="CRM" Subtitle="고객 카드를 등록하고 상담 이력을 관리합니다.">
+    <ChildContent>
+        <MudButton Variant="Variant.Filled" Color="Color.Primary"
+                   StartIcon="@Icons.Material.Filled.PersonAdd"
+                   Href="/taxbaik/admin/clients/create">
+            고객 등록
+        </MudButton>
+    </ChildContent>
+</AdminPageHeader>
 
 @* 검색/필터 바 *@
 <MudPaper Class="admin-surface mb-3 pa-3" Elevation="0">
@@ -53,10 +50,7 @@
     }
     else if (!clients.Any())
     {
-        <div class="pa-6 text-center">
-            <MudIcon Icon="@Icons.Material.Filled.PeopleAlt" Style="font-size:3rem; opacity:.3;" />
-            <MudText Class="mt-2 text-muted">등록된 고객이 없습니다.</MudText>
-        </div>
+        <AdminEmptyState Icon="@Icons.Material.Filled.PeopleAlt" Message="등록된 고객이 없습니다." />
     }
     else
     {