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.Application/PublicMessageCQ/Queries/GetAllMessages/AdminPublicMessageDto.cs

@@ -0,0 +1,27 @@
+using CMSMicroservice.Domain.Enums;
+
+namespace CMSMicroservice.Application.PublicMessageCQ.Queries.GetAllMessages;
+
+/// <summary>
+/// DTO پیام عمومی برای Admin (با اطلاعات بیشتر)
+/// </summary>
+public class AdminPublicMessageDto
+{
+    public long Id { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
+    public MessageType Type { get; set; }
+    public string TypeName { get; set; } = string.Empty;
+    public MessagePriority Priority { get; set; }
+    public string PriorityName { get; set; } = string.Empty;
+    public bool IsActive { get; set; }
+    public DateTime StartsAt { get; set; }
+    public DateTime ExpiresAt { get; set; }
+    public long CreatedByUserId { get; set; }
+    public int ViewCount { get; set; }
+    public string? LinkUrl { get; set; }
+    public string? LinkText { get; set; }
+    public DateTime Created { get; set; }
+    public DateTime? LastModified { get; set; }
+    public bool IsExpired { get; set; }
+}