docs: Update architecture guidelines for Razor Pages + Cookie Auth (2026-07-09)

- Add architecture change notice in CLAUDE.md (Blazor WASM → Razor Pages)
- Mark Phase 8/9/13 as [레거시] (no longer current standard)
- Update priority guidelines: add ADMIN_RAZORPAGES_ROADMAP.md and ADMIN_LEGACY_BLAZOR.md
- Fix STACK_TEMPLATE_WBS.md Target Template table: Admin CRUD now uses Razor Pages + Cookie Authentication
- Add legacy references for previous WebAssembly/MudBlazor approach

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

docs/STACK_TEMPLATE_WBS.md

@@ -18,12 +18,12 @@
 | 영역 | 권장 방식 | 비고 |
 | --- | --- | --- |
 | Public Home | Static SSR + 필요한 부분만 Interactive WebAssembly | 초기 로딩과 SEO 우선 |
-| Login | Static SSR 또는 Razor Page form | MudBlazor 의존 금지 |
-| Home/Dashboard | Interactive WebAssembly + MudBlazor | 사용자 인터랙션 중심 |
-| Admin CRUD | Interactive WebAssembly + API-first | BrowserClient 경유 |
-| API | Minimal API 또는 Controller + OpenAPI | 계약 우선 |
+| Login | Razor Pages form + Cookie Authentication | MudBlazor 의존 금지 (레거시: Interactive WebAssembly 참고) |
+| Home/Dashboard | Razor Pages + Cookie Authentication | 서버 렌더링 우선 (레거시: Interactive WebAssembly + MudBlazor 참고) |
+| Admin CRUD | Razor Pages + Repository Pattern + Tabler UI | Cookie Authentication 기준 (레거시: Interactive WebAssembly + API-first 참고) |
+| API | Controller + OpenAPI (외부 클라이언트) | 계약 우선, JWT 기반 |
 | Persistence | Dapper + `NpgsqlDataSource` singleton | connection pool 직접 관리 금지 |
-| Auth | 브라우저는 HttpOnly Secure Cookie 우선, 외부 클라이언트만 JWT | localStorage 저장 금지 |
+| Auth | 브라우저는 Cookie Authentication, 외부 클라이언트만 JWT | localStorage 저장 금지 |
 
 현재 저장소 기준 예외: