fix: restore WASM static file serving configuration

Reverted breaking changes from commit 08b002d (2026-07-04 20:28):

1. UseStaticFiles path mapping (reverted):
   - Before (c960860 - working): app.UseStaticFiles("/admin")
   - After (08b002d): app.UseStaticFiles(new StaticFileOptions { RequestPath = "/admin" })
   - Now (fixed): app.UseStaticFiles("/admin") ✅

2. Removed MapRazorComponents (blocking WASM):
   - app.MapRazorComponents<...>() was interfering with static file serving
   - Blazor WebAssembly should be pure static WASM, not server-side
   - Removed in favor of MapFallbackToFile pattern ✅

3. Restored portal fallback:
   - Added app.MapFallbackToFile("portal/{*path:nonfile}", "portal/index.html")
   - Added root redirect: app.MapGet("/", ...)

4. Fixed index.html script path:
   - Before: <script src="/_framework/blazor.webassembly.js"></script> (absolute)
   - After: <script src="_framework/blazor.webassembly.js"></script> (relative)
   - Relative path respects base href="/taxbaik/admin/" ✅

**Verification:**
- WASM files (45KB+): ✅ Present, correct hash
- Server delivery: ✅ 200 OK, correct SHA-256
- Static file serving: ✅ /taxbaik/admin/_framework/* accessible
- Issue: blazor.boot.json still missing (blocks WASM initialization)

**Status:**
- Login form: ✅ Renders
- WASM bootstrap script: ✅ Loads (with relative path fix)
- WASM runtime: ❌ Blocked (needs blazor.boot.json)
- Dashboard: ❌ Loading indefinitely

Next: Investigate why blazor.boot.json is not generated in Debug build.

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

src/TaxBaik.Web/Program.cs

@@ -370,8 +370,8 @@ app.UseResponseCompression();
 
 // 정적 파일 제공 (WASM 프레임워크 파일 포함)
 app.UseStaticFiles();
-app.UseStaticFiles(new StaticFileOptions { RequestPath = "/admin" });
-app.UseStaticFiles(new StaticFileOptions { RequestPath = "/portal" });
+app.UseStaticFiles("/admin");
+app.UseStaticFiles("/portal");
 
 app.UseSession();  // TempData 쿠키 저장소
 app.UseRouting();
@@ -394,13 +394,12 @@ app.MapHealthChecks("/healthz");
 app.MapRazorPages();  // Sitemap.cshtml, Rss.cshtml, Feed.cshtml
 app.MapStaticAssets();
 
-// Blazor WebAssembly Admin Client (WASM 파일 제공 필수)
-app.MapRazorComponents<TaxBaik.WasmClient.Components.Admin.App>()
-   .AddInteractiveWebAssemblyRenderMode()
-   .AllowAnonymous();
+// 루트 경로 기본값
+app.MapGet("/", () => Results.Redirect("/taxbaik/"));
 
 // SPA 라우팅 폴백 (가장 마지막에!)
 app.MapFallbackToFile("admin/{*path:nonfile}", "admin/index.html");
+app.MapFallbackToFile("portal/{*path:nonfile}", "portal/index.html");
 
 // 애플리케이션 시작/종료 로깅
 try