Add user-specific persistent grid/band layouts support

Implemented user-customizable, persistent grid and band layouts for CatalogsGrid and MassDataGrid. Added backend API, database entity, and repository for storing layouts per user. Refactored grids to support dynamic band/column rendering, layout management UI, and per-user storage via localStorage and the new API. Registered all necessary services and updated data context. Enables flexible, user-specific grid experiences with saved layouts.

DbFirst.BlazorWebApp/Program.cs

@@ -25,12 +25,17 @@ if (!string.IsNullOrWhiteSpace(apiBaseUrl))
     {
         client.BaseAddress = new Uri(apiBaseUrl);
     });
+    builder.Services.AddHttpClient<LayoutApiClient>(client =>
+    {
+        client.BaseAddress = new Uri(apiBaseUrl);
+    });
 }
 else
 {
     builder.Services.AddHttpClient<CatalogApiClient>();
     builder.Services.AddHttpClient<DashboardApiClient>();
     builder.Services.AddHttpClient<MassDataApiClient>();
+    builder.Services.AddHttpClient<LayoutApiClient>();
 }
 
 var app = builder.Build();