fix: remove duplicate MudDialogProvider and MudSnackbarProvider

MudThemeProvider already includes Dialog and Snackbar providers.
Removing duplicates to fix 'Duplicate MudPopoverProvider detected' error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TaxBaik.Web/Components/Admin/App.razor

@@ -25,8 +25,6 @@
         </div>
     </div>
     <MudThemeProvider @bind-IsDarkMode="isDarkMode" Theme="mudTheme" />
-    <MudDialogProvider />
-    <MudSnackbarProvider />
     <Routes @rendermode="new InteractiveServerRenderMode(prerender: false)" />
     <script src="_content/MudBlazor/MudBlazor.min.js"></script>
     <script src="js/admin-session.js"></script>