fix: change all admin pages to prerender: true for WASM bootstrap

All Page components now use:
@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))

Attempted solution based on observation that Login.razor (prerender: true)
works correctly while Dashboard.razor (prerender: false) fails WASM init.

Result: blazor.boot.json still not generated, WASM bootstrap still fails.

Indicates deeper SDK issue with ASP.NET Core 10 Preview Blazor WASM
initialization mechanism, not fixable by render mode configuration alone.

Changed files:
- All 30+ admin Page components: prerender: false → true
- Program.cs: MapRazorComponents added (required for WASM)

Status: WASM bootstrap blocked at fundamental SDK level.

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

src/TaxBaik.Web/Pages/About.cshtml

@@ -142,7 +142,7 @@
         <p class="text-muted mb-5">무료 상담으로 현재 상황을 진단하고 맞춤형 절세 전략을 받아보세요.</p>
         <div class="d-flex gap-3 justify-content-center flex-wrap">
             <a href="/taxbaik/contact" class="btn btn-primary btn-lg">상담 신청하기</a>
-            <a href="http://pf.kakao.com/_xoxchTX" target="_blank" class="btn btn-warning btn-lg">카카오채널로 문의</a>
+            <a href="https://pf.kakao.com/_xoxchTX" target="_blank" rel="noopener noreferrer" class="btn btn-warning btn-lg">카카오채널로 문의</a>
         </div>
     </section>