feat: Implement Public Message Management Commands and Queries

- Add GetUserPackageStatusQueryValidator for user package status validation.
- Create ArchiveMessageCommand and ArchiveMessageCommandHandler for archiving public messages.
- Implement ArchiveMessageCommandValidator to validate message ID.
- Introduce PublishMessageCommand and PublishMessageCommandHandler for publishing messages.
- Add PublishMessageCommandValidator for validating publish message requests.
- Implement GetPublicMessageQuery and GetPublicMessageQueryHandler for retrieving public messages.
- Create GetPublicMessageQueryValidator for validating public message requests.
- Add ApplyDiscountToOrderCommand and ApplyDiscountToOrderCommandHandler for applying discounts to orders.
- Implement ApplyDiscountToOrderCommandValidator for validating discount application requests.
- Create UpdateOrderStatusCommand and UpdateOrderStatusCommandHandler for changing order statuses.
- Implement UpdateOrderStatusCommandValidator for validating order status updates.
- Add CalculateOrderPVQuery and CalculateOrderPVQueryHandler for calculating order PV.
- Implement CalculateOrderPVQueryValidator for validating PV calculation requests.
- Create GetOrdersByDateRangeQuery and GetOrdersByDateRangeQueryHandler for retrieving orders by date range.
- Implement GetOrdersByDateRangeQueryValidator for validating date range queries.
- Add PublicMessage entity to represent public messages in the system.
- Implement PublicMessageService for handling public message operations via gRPC.

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

@@ -15,9 +15,9 @@ public class AdminPublicMessageDto
     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 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; }