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.Infrastructure/Persistence/ApplicationDbContextInitialiser.cs

@@ -111,6 +111,14 @@ public  class ApplicationDbContextInitialiser
                 Scope = ConfigurationScope.Club,
                 IsActive = true
             },
+            new SystemConfiguration
+            {
+                Key = "Club.MembershipGiftValue",
+                Value = "25200000",
+                Description = "مبلغ هدیه حق عضویت باشگاه (ریال) - این مبلغ از کیف پول کم نمی‌شود",
+                Scope = ConfigurationScope.Club,
+                IsActive = true
+            },
 
             // System Configuration
             new SystemConfiguration