feat: WBS-UX-03 FAQ 관리 기능 구현 — 어드민 CRUD + 홈페이지 DB 연동

DB:
- V007__CreateFaqs.sql: faqs 테이블 (question, answer, category,
  sort_order, is_active) + 기본 FAQ 4개 시드

Domain:
- Faq 엔티티
- IFaqRepository (GetActiveAsync, GetAllAsync, CRUD)

Infrastructure:
- FaqRepository: sort_order 정렬, CRUD

Application:
- FaqService: Categories 상수, Validate (질문·답변 필수)

Admin UI (Blazor):
- FaqList.razor: 전체 목록, 활성/비활성 상태 칩, 삭제 확인
- FaqEdit.razor: 질문/답변/카테고리/순서/활성 토글 폼
- MainLayout: 홈페이지 그룹 하위에 FAQ 관리 메뉴 추가

홈페이지:
- Index.cshtml 하드코딩 FAQ → ActiveFaqs DB 루프로 교체
- FAQ 없으면 섹션 전체 숨김 (빈 DB에 안전)
- IndexModel: FaqService 주입, Task.WhenAll 병렬 로드

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TaxBaik.Web/Pages/Index.cshtml.cs

@@ -10,35 +10,42 @@ public class IndexModel : PageModel
     private readonly BlogService _blogService;
     private readonly SeasonalMarketingService _seasonalMarketingService;
     private readonly AnnouncementService _announcementService;
+    private readonly FaqService _faqService;
 
     public List<BlogPost> RecentPosts { get; set; } = [];
     public List<BlogPost> SeasonalPosts { get; set; } = [];
     public CurrentSeasonDto? CurrentSeason { get; set; }
     public List<Announcement> ActiveAnnouncements { get; set; } = [];
+    public List<Faq> ActiveFaqs { get; set; } = [];
 
     public IndexModel(
         BlogService blogService,
         SeasonalMarketingService seasonalMarketingService,
-        AnnouncementService announcementService)
+        AnnouncementService announcementService,
+        FaqService faqService)
     {
         _blogService = blogService;
         _seasonalMarketingService = seasonalMarketingService;
         _announcementService = announcementService;
+        _faqService = faqService;
     }
 
     public async Task OnGetAsync()
     {
         CurrentSeason = _seasonalMarketingService.GetCurrentSeason();
 
-        try
-        {
-            ActiveAnnouncements = (await _announcementService.GetActiveAsync()).ToList();
-        }
-        catch
-        {
-            ActiveAnnouncements = [];
-        }
+        var announcementsTask = LoadSafeAsync(() => _announcementService.GetActiveAsync());
+        var faqsTask = LoadSafeAsync(() => _faqService.GetActiveAsync());
+        var blogTask = LoadBlogAsync();
 
+        await Task.WhenAll(announcementsTask, faqsTask, blogTask);
+
+        ActiveAnnouncements = (await announcementsTask)?.ToList() ?? [];
+        ActiveFaqs = (await faqsTask)?.ToList() ?? [];
+    }
+
+    private async Task LoadBlogAsync()
+    {
         try
         {
             if (CurrentSeason is not null && !string.IsNullOrEmpty(CurrentSeason.RelatedCategorySlug))
@@ -60,4 +67,10 @@ public class IndexModel : PageModel
             SeasonalPosts = [];
         }
     }
+
+    private static async Task<IEnumerable<T>?> LoadSafeAsync<T>(Func<Task<IEnumerable<T>>> loader)
+    {
+        try { return await loader(); }
+        catch { return null; }
+    }
 }