Add migration for DiscountProductImages table

- Created a new table `DiscountProductImages` in the CMS schema.
- Added columns for image details including `Title`, `AltText`, `ImagePath`, `ThumbnailPath`, `SortOrder`, `IsActive`, `Created`, `CreatedBy`, `LastModified`, `LastModifiedBy`, and `IsDeleted`.
- Established a foreign key relationship with the `DiscountProducts` table.
- Created indexes on `DiscountProductId` and a composite index on `DiscountProductId` and `SortOrder`.

src/CMSMicroservice.Application/DiscountShopCQ/Commands/UpdateDiscountProductImage/UpdateDiscountProductImageCommand.cs

@@ -0,0 +1,13 @@
+using MediatR;
+
+namespace CMSMicroservice.Application.DiscountShopCQ.Commands.UpdateDiscountProductImage;
+
+public class UpdateDiscountProductImageCommand : IRequest<bool>
+{
+    public long Id { get; set; }
+    public string ImagePath { get; set; } = string.Empty;
+    public string ThumbnailPath { get; set; } = string.Empty;
+    public string? Title { get; set; }
+    public string? AltText { get; set; }
+    public bool IsActive { get; set; }
+}

src/CMSMicroservice.Application/DiscountShopCQ/Commands/UpdateDiscountProductImage/UpdateDiscountProductImageCommandHandler.cs

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+using CMSMicroservice.Application.Common.Interfaces;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace CMSMicroservice.Application.DiscountShopCQ.Commands.UpdateDiscountProductImage;
+
+public class UpdateDiscountProductImageCommandHandler : IRequestHandler<UpdateDiscountProductImageCommand, bool>
+{
+    private readonly IApplicationDbContext _context;
+
+    public UpdateDiscountProductImageCommandHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<bool> Handle(UpdateDiscountProductImageCommand request, CancellationToken cancellationToken)
+    {
+        var image = await _context.DiscountProductImages
+            .FirstOrDefaultAsync(i => i.Id == request.Id, cancellationToken);
+
+        if (image == null)
+            return false;
+
+        image.ImagePath = request.ImagePath;
+        image.ThumbnailPath = request.ThumbnailPath;
+        image.Title = request.Title;
+        image.AltText = request.AltText;
+        image.IsActive = request.IsActive;
+
+        await _context.SaveChangesAsync(cancellationToken);
+        return true;
+    }
+}