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.Infrastructure/Repositories/LayoutRepository.cs

@@ -0,0 +1,66 @@
+using DbFirst.Application.Repositories;
+using DbFirst.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace DbFirst.Infrastructure.Repositories;
+
+public class LayoutRepository : ILayoutRepository
+{
+    private readonly ApplicationDbContext _db;
+
+    public LayoutRepository(ApplicationDbContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<SmfLayout?> GetAsync(string layoutType, string layoutKey, string userName, CancellationToken cancellationToken = default)
+    {
+        return await _db.SmfLayouts.AsNoTracking()
+            .FirstOrDefaultAsync(x => x.LayoutType == layoutType && x.LayoutKey == layoutKey && x.UserName == userName, cancellationToken);
+    }
+
+    public async Task<SmfLayout> UpsertAsync(string layoutType, string layoutKey, string userName, byte[] layoutData, CancellationToken cancellationToken = default)
+    {
+        var entity = await _db.SmfLayouts
+            .FirstOrDefaultAsync(x => x.LayoutType == layoutType && x.LayoutKey == layoutKey && x.UserName == userName, cancellationToken);
+
+        if (entity == null)
+        {
+            entity = new SmfLayout
+            {
+                Active = true,
+                LayoutType = layoutType,
+                LayoutKey = layoutKey,
+                UserName = userName,
+                LayoutData = layoutData,
+                AddedWho = userName,
+                AddedWhen = DateTime.Now
+            };
+            _db.SmfLayouts.Add(entity);
+        }
+        else
+        {
+            entity.Active = true;
+            entity.LayoutData = layoutData;
+            entity.ChangedWho = userName;
+        }
+
+        await _db.SaveChangesAsync(cancellationToken);
+        return entity;
+    }
+
+    public async Task<bool> DeleteAsync(string layoutType, string layoutKey, string userName, CancellationToken cancellationToken = default)
+    {
+        var entity = await _db.SmfLayouts
+            .FirstOrDefaultAsync(x => x.LayoutType == layoutType && x.LayoutKey == layoutKey && x.UserName == userName, cancellationToken);
+
+        if (entity == null)
+        {
+            return false;
+        }
+
+        _db.SmfLayouts.Remove(entity);
+        await _db.SaveChangesAsync(cancellationToken);
+        return true;
+    }
+}