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.Core.Tests/obj/project.assets.json

@@ -1,5 +1,5 @@
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-  "version": 3,
+  "version": 4,
   "targets": {
     "net10.0": {
       "coverlet.collector/6.0.4": {
@@ -1178,7 +1178,7 @@
     ]
   },
   "packageFolders": {
-    "C:\\Users\\kjh20\\.nuget\\packages\\": {},
+    "D:\\DevCache\\nuget-packages": {},
     "C:\\Program Files (x86)\\Microsoft Visual Studio\\Shared\\NuGetPackages": {},
     "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder": {}
   },
@@ -1188,7 +1188,7 @@
       "projectUniqueName": "C:\\Temp\\data_feed\\src\\dotnet\\QuantEngine.Core.Tests\\QuantEngine.Core.Tests.csproj",
       "projectName": "QuantEngine.Core.Tests",
       "projectPath": "C:\\Temp\\data_feed\\src\\dotnet\\QuantEngine.Core.Tests\\QuantEngine.Core.Tests.csproj",
-      "packagesPath": "C:\\Users\\kjh20\\.nuget\\packages\\",
+      "packagesPath": "D:\\DevCache\\nuget-packages",
       "outputPath": "C:\\Temp\\data_feed\\src\\dotnet\\QuantEngine.Core.Tests\\obj\\",
       "projectStyle": "PackageReference",
       "fallbackFolders": [
@@ -1206,11 +1206,11 @@
       "sources": {
         "C:\\Program Files (x86)\\Microsoft SDKs\\NuGetPackages\\": {},
         "C:\\Program Files\\dotnet\\library-packs": {},
-        "https://api.nuget.org/v3/index.json": {},
-        "https://nuget.telerik.com/v3/index.json": {}
+        "https://api.nuget.org/v3/index.json": {}
       },
       "frameworks": {
         "net10.0": {
+          "framework": "net10.0",
           "targetAlias": "net10.0",
           "projectReferences": {
             "C:\\Temp\\data_feed\\src\\dotnet\\QuantEngine.Application\\QuantEngine.Application.csproj": {
@@ -1235,10 +1235,11 @@
         "auditLevel": "low",
         "auditMode": "all"
       },
-      "SdkAnalysisLevel": "10.0.100"
+      "SdkAnalysisLevel": "10.0.300"
     },
     "frameworks": {
       "net10.0": {
+        "framework": "net10.0",
         "targetAlias": "net10.0",
         "dependencies": {
           "Microsoft.NET.Test.Sdk": {
@@ -1274,7 +1275,7 @@
             "privateAssets": "all"
           }
         },
-        "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\10.0.100/PortableRuntimeIdentifierGraph.json",
+        "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\10.0.301/PortableRuntimeIdentifierGraph.json",
         "packagesToPrune": {
           "Microsoft.CSharp": "(,4.7.32767]",
           "Microsoft.VisualBasic": "(,10.4.32767]",