Add validators and services for Product Galleries and Product Tags

- Implemented Create, Delete, Get, and Update validators for Product Galleries.
- Added Create, Delete, Get, and Update validators for Product Tags.
- Created service classes for handling Discount Categories, Discount Orders, Discount Products, Discount Shopping Cart, Product Categories, Product Galleries, and Product Tags.
- Each service class integrates with CQRS for command and query handling.
- Established mapping profiles for Product Galleries.

src/CMSMicroservice.Domain/Entities/Product.cs

@@ -0,0 +1,42 @@
+namespace CMSMicroservice.Domain.Entities;
+//محصول
+public class Product : BaseAuditableEntity
+{
+    public string Title { get; set; }
+    public string Description { get; set; }
+    public string ShortInfomation { get; set; }
+    public string FullInformation { get; set; }
+    public long Price { get; set; }
+    public int Discount { get; set; }
+    public int Rate { get; set; }
+    public string ImagePath { get; set; }
+    public string ThumbnailPath { get; set; }
+    public int SaleCount { get; set; }
+    public int ViewCount { get; set; }
+    public int RemainingCount { get; set; }
+    
+    // ============= Club Shop Fields =============
+    
+    /// <summary>
+    /// آیا این محصول فقط در فروشگاه باشگاه موجود است
+    /// </summary>
+    public bool IsClubExclusive { get; set; }
+    
+    /// <summary>
+    /// درصد تخفیف باشگاه (0 تا 100)
+    /// </summary>
+    public int ClubDiscountPercent { get; set; }
+    
+    // ============= Navigation Properties =============
+    
+    //UserCarts Collection Navigation Reference
+    public virtual ICollection<UserCart> UserCarts { get; set; }
+    //ProductGalleries Collection Navigation Reference
+    public virtual ICollection<ProductGallery> ProductGalleries { get; set; }
+    //FactorDetails Collection Navigation Reference
+    public virtual ICollection<FactorDetails> FactorDetails { get; set; }
+    //ProductCategory Collection Navigation Reference
+    public virtual ICollection<ProductCategory> ProductCategories { get; set; }
+    //ProductTag Collection Navigation Reference
+    public virtual ICollection<ProductTag> ProductTags { get; set; }
+}