fix: resolve admin 500 error by fixing render mode and assembly reference

- App.razor: Change Routes from InteractiveWebAssemblyRenderMode to InteractiveServerRenderMode (admin requires Blazor Server, not WebAssembly)
- Program.cs: Remove unnecessary AddInteractiveWebAssemblyRenderMode() and AddInteractiveWebAssemblyComponents() registrations
- Program.cs: Remove broken TaxBaik.WasmClient reference from MapRazorComponents (actual project is TaxBaik.Web.Client)

The 500 error was caused by conflicting render modes and a non-existent assembly reference. Admin pages now correctly use Blazor Server interactivity.

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

TaxBaik.Web/Components/Admin/App.razor

@@ -37,7 +37,7 @@
         </div>
     </div>
     <MudThemeProvider @bind-IsDarkMode="isDarkMode" Theme="mudTheme" />
-    <Routes @rendermode="new InteractiveWebAssemblyRenderMode(prerender: true)" />
+    <Routes @rendermode="new InteractiveServerRenderMode(prerender: true)" />
     <script src="/taxbaik/_content/MudBlazor/MudBlazor.min.js"></script>
     <script src="/taxbaik/js/admin-session.js"></script>
     <script src="/taxbaik/_framework/blazor.web.js"></script>

TaxBaik.Web/Program.cs

@@ -74,8 +74,7 @@ builder.Services.AddRateLimiter(options =>
 // Razor Pages + Blazor Server 통합
 builder.Services.AddRazorPages();
 builder.Services.AddRazorComponents()
-    .AddInteractiveServerComponents()
-    .AddInteractiveWebAssemblyComponents();
+    .AddInteractiveServerComponents();
 builder.Services.Configure<Microsoft.AspNetCore.Components.Server.CircuitOptions>(options =>
 {
     options.DetailedErrors = true;
@@ -391,8 +390,6 @@ app.MapStaticAssets();
 // 인증은 Blazor AuthorizeRouteView → RedirectToLogin 에서 처리한다.
 app.MapRazorComponents<TaxBaik.Web.Components.Admin.App>()
    .AddInteractiveServerRenderMode()
-   .AddInteractiveWebAssemblyRenderMode()
-   .AddAdditionalAssemblies(typeof(TaxBaik.WasmClient._Imports).Assembly)
    .AllowAnonymous();
 
 // 애플리케이션 시작/종료 로깅