fix: resolve 'Assembly already defined' - remove AddAdditionalAssemblies

MapRazorComponents<TaxBaik.WasmClient.Components.Admin.App>() automatically includes
the root component's assembly, so AddAdditionalAssemblies() was causing duplication.

Also remove VersionInfo @inject from App.razor since WebAssembly components
cannot access server DI container. Use hardcoded 'unknown' for version.

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

TaxBaik.Web/Program.cs

@@ -392,9 +392,10 @@ app.MapStaticAssets();
 // Phase 8: WebAssembly 렌더 모드 완전 마이그레이션
 // - App.razor: TaxBaik.WasmClient (호스트, WebAssembly)
 // - Routes + Pages + Shared + Layout + Forms: TaxBaik.WasmClient (WebAssembly)
+// MapRazorComponents<TaxBaik.WasmClient.Components.Admin.App>()가 이미 어셈블리 포함하므로
+// AddAdditionalAssemblies 불필요 (중복 시 "Assembly already defined" 에러 발생)
 app.MapRazorComponents<TaxBaik.WasmClient.Components.Admin.App>()
    .AddInteractiveWebAssemblyRenderMode()
-   .AddAdditionalAssemblies(typeof(TaxBaik.WasmClient._Imports).Assembly)
    .AllowAnonymous();
 
 // 애플리케이션 시작/종료 로깅