refactor(web): MudBlazor → Fluent UI Blazor v5 마이그레이션 완료

**주요 변경사항:**
- NuGet: MudBlazor 6.10.0 → Microsoft.FluentUI.AspNetCore.Components 5.0.0-rc.4-26177.1 변경
- Program.cs: MudBlazor DI → Fluent UI DI 등록
- App.razor: CSS/JS 라이브러리 및 프로바이더 변경
- MainLayout.razor: MudLayout → FluentStack 기반 재구성
  - FluentHeader 헤더 적용
  - 네비게이션 사이드바 토글 기능
  - Flexbox 레이아웃
- NavMenu.razor: MudNavMenu/MudNavLink → FluentNavMenu/FluentNavLink
- Dashboard.razor: MudBlazor 모든 컴포넌트 → Fluent UI v5로 변환
  - MudCard → FluentCard
  - MudGrid → FluentStack (Wrap)
  - MudText → HTML (h1, p, span)
  - MudChip → FluentBadge
  - MudTable → FluentDataGrid
  - MudAlert → div (커스텀 스타일)
- Operations.razor: 동일 패턴 적용
- _Imports.razor: Fluent UI 네임스페이스 추가

**빌드 결과:** ✅ SUCCESS (0 errors, 5 warnings)

**다음 단계:** Stage 2 - Python → .NET 마이그레이션

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

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.AssemblyInfo.cs

@@ -13,10 +13,10 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("QuantEngine.Application")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+325c6d64e17702c514691d989194bc4dc0d08460")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+aad4788e8430ad7244d0628047aaf40d0590ef95")]
 [assembly: System.Reflection.AssemblyProductAttribute("QuantEngine.Application")]
 [assembly: System.Reflection.AssemblyTitleAttribute("QuantEngine.Application")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
 
-// MSBuild WriteCodeFragment 클래스에서 생성되었습니다.
+// Generated by the MSBuild WriteCodeFragment class.