fix: add MapRazorComponents registration for Blazor WebAssembly clients

- Register Admin WASM client (TaxBaik.Web.Client)
- Register Portal WASM client (TaxBaik.Portal.Client)
- This enables blazor.boot.json generation during publish
- Fixes 'unhandled exception' error in browser console

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

src/TaxBaik.Web/Program.cs

@@ -392,6 +392,18 @@ app.MapHealthChecks("/healthz");
 app.MapRazorPages();  // Sitemap.cshtml, Rss.cshtml, Feed.cshtml
 app.MapStaticAssets();
 
+// Blazor WebAssembly Admin Client
+app.MapRazorComponents<TaxBaik.Web.Client.Components.Admin.App>()
+   .AddInteractiveWebAssemblyRenderMode()
+   .AddAdditionalAssemblies(typeof(TaxBaik.Web.Client._Imports).Assembly)
+   .AllowAnonymous();
+
+// Portal WASM Client
+app.MapRazorComponents<TaxBaik.Portal.Client.Components.App>()
+   .AddInteractiveWebAssemblyRenderMode()
+   .AddAdditionalAssemblies(typeof(TaxBaik.Portal.Client._Imports).Assembly)
+   .AllowAnonymous();
+
 // SPA 라우팅 폴백 (가장 마지막에!)
 app.MapFallbackToFile("admin/{*path:nonfile}", "admin/index.html");
 app.MapFallbackToFile("portal/{*path:nonfile}", "portal/index.html");