refactor: Web과 Admin 통합 - 단일 포트 5001로 운영

분리의 단점을 제거하고 단일 앱으로 통합:

구조 변경:
- TaxBaik.Admin → TaxBaik.Web/Components/Admin/
- Admin Services → TaxBaik.Web/Services/
- 포트: 5001 (기존 5002 제거)

경로:
- 홈페이지: http://localhost:5001/taxbaik
- 관리자: http://localhost:5001/taxbaik/admin

기술:
- Razor Pages (Web) + Blazor Server (Admin) 통합
- 단일 Program.cs로 양쪽 모두 지원
- JWT 인증 유지
- MudBlazor UI 유지

장점:
- 개발 복잡도 감소 (터미널 1개)
- 배포 단순화 (앱 1개)
- DB 마이그레이션 1회 실행

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

TaxBaik.Web/Program.cs

@@ -1,13 +1,29 @@
 using System.IO.Compression;
 using System.Text.Encodings.Web;
 using System.Text.Unicode;
+using Microsoft.AspNetCore.Components.Authorization;
 using Microsoft.AspNetCore.ResponseCompression;
+using MudBlazor.Services;
 using TaxBaik.Application;
 using TaxBaik.Infrastructure;
+using TaxBaik.Web.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
+// Razor Pages + Blazor Server 통합
 builder.Services.AddRazorPages();
+builder.Services.AddRazorComponents().AddInteractiveServerComponents();
+
+// Blazor 인증
+builder.Services.AddScoped<AuthService>();
+builder.Services.AddScoped<CustomAuthenticationStateProvider>();
+builder.Services.AddScoped<AuthenticationStateProvider>(sp => sp.GetRequiredService<CustomAuthenticationStateProvider>());
+builder.Services.AddScoped<ILocalStorageService, LocalStorageService>();
+builder.Services.AddCascadingAuthenticationState();
+builder.Services.AddAuthorizationCore();
+
+// UI & 캐시
+builder.Services.AddMudServices();
 builder.Services.AddMemoryCache();
 builder.Services.AddResponseCompression(opts => {
     opts.Providers.Add<GzipCompressionProvider>();
@@ -58,6 +74,7 @@ app.UsePathBase("/taxbaik");
 app.UseResponseCompression();
 app.UseStaticFiles();
 app.UseRouting();
+app.UseAuthorization();
 app.UseAntiforgery();
 
 if (!app.Environment.IsDevelopment())
@@ -66,6 +83,8 @@ if (!app.Environment.IsDevelopment())
     app.UseHsts();
 }
 
+// Razor Pages + Blazor 매핑
 app.MapRazorPages();
+app.MapRazorComponents<TaxBaik.Web.Components.Admin.App>().AddInteractiveServerRenderMode();
 
 app.Run();