fix: add AddAdditionalAssemblies for WebAssembly runtime

- Add AddAdditionalAssemblies(typeof(TaxBaik.Web.Components.Admin._Imports).Assembly)
- Essential for Blazor WebAssembly to discover components and generate _framework files
- Fixes 404 errors on WASM bootstrap files (blazor.webassembly.js, dotnet.wasm, etc)

This resolves the infinite loading screen after admin login.

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

src/TaxBaik.Web/Program.cs

@@ -428,6 +428,7 @@ app.MapStaticAssets();
 // API는 웹 서버에서만 제공 (클라이언트 프로젝트 분리 불필요)
 app.MapRazorComponents<TaxBaik.Web.Components.Admin.App>()
    .AddInteractiveWebAssemblyRenderMode()
+   .AddAdditionalAssemblies(typeof(TaxBaik.Web.Components.Admin._Imports).Assembly)
    .AllowAnonymous();
 
 // 애플리케이션 시작/종료 로깅