fix: update Routes.razor namespace to match unified architecture

CRITICAL FIX - Blazor routing:
- @namespace TaxBaik.WasmClient.Components.Admin → TaxBaik.Web.Components.Admin
- AppAssembly from WasmClient to Web assembly
- DefaultLayout from TaxBaik.WasmClient to TaxBaik.Web

This fixes:
✅ Router properly discovers layout components
✅ AdminShell renders on all protected pages
✅ hideLoading() function called when page ready
✅ Loading overlay disappears after WASM boot

Root cause: Routes.razor still referenced old WasmClient namespace
preventing MainLayout/AdminShell from being found.

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

src/TaxBaik.Web/Components/Admin/Pages/TaxFilingSchedules.razor

@@ -2,7 +2,7 @@
 @rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.Domain.Entities
-@using TaxBaik.WasmClient.Components.Admin.Shared
+@using TaxBaik.Web.Components.Admin.Shared
 @inject ITaxFilingScheduleBrowserClient TaxFilingClient
 @inject IClientBrowserClient ClientClient
 @inject ISnackbar Snackbar