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.Protobuf/Protos/discountorder.proto

@@ -0,0 +1,177 @@
+syntax = "proto3";
+
+package discountorder;
+
+import "public_messages.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/wrappers.proto";
+import "google/protobuf/timestamp.proto";
+import "google/api/annotations.proto";
+
+option csharp_namespace = "CMSMicroservice.Protobuf.Protos.DiscountOrder";
+
+service DiscountOrderContract
+{
+    rpc PlaceOrder(PlaceOrderRequest) returns (PlaceOrderResponse){
+        option (google.api.http) = {
+            post: "/PlaceOrder"
+            body: "*"
+        };
+    };
+    rpc CompleteOrderPayment(CompleteOrderPaymentRequest) returns (CompleteOrderPaymentResponse){
+        option (google.api.http) = {
+            post: "/CompleteOrderPayment"
+            body: "*"
+        };
+    };
+    rpc UpdateOrderStatus(UpdateOrderStatusRequest) returns (UpdateOrderStatusResponse){
+        option (google.api.http) = {
+            put: "/UpdateOrderStatus"
+            body: "*"
+        };
+    };
+    rpc GetOrderById(GetOrderByIdRequest) returns (GetOrderByIdResponse){
+        option (google.api.http) = {
+            get: "/GetOrderById"
+        };
+    };
+    rpc GetUserOrders(GetUserOrdersRequest) returns (GetUserOrdersResponse){
+        option (google.api.http) = {
+            get: "/GetUserOrders"
+        };
+    };
+}
+
+// Place Order (Initial Step - Create Order)
+message PlaceOrderRequest
+{
+    int64 user_id = 1;
+    int64 user_address_id = 2;
+    int64 discount_balance_to_use = 3; // Amount from DiscountBalance wallet
+    google.protobuf.StringValue notes = 4;
+}
+
+message PlaceOrderResponse
+{
+    bool success = 1;
+    string message = 2;
+    int64 order_id = 3;
+    int64 gateway_amount = 4; // Amount to pay via gateway (if any)
+    google.protobuf.StringValue payment_url = 5; // Payment gateway URL (if needed)
+}
+
+// Complete Order Payment (After Gateway Callback)
+message CompleteOrderPaymentRequest
+{
+    int64 order_id = 1;
+    google.protobuf.StringValue transaction_id = 2;
+    bool payment_success = 3;
+}
+
+message CompleteOrderPaymentResponse
+{
+    bool success = 1;
+    string message = 2;
+}
+
+// Update Order Status (Admin)
+message UpdateOrderStatusRequest
+{
+    int64 order_id = 1;
+    DeliveryStatus delivery_status = 2;
+    google.protobuf.StringValue tracking_code = 3;
+    google.protobuf.StringValue admin_notes = 4;
+}
+
+message UpdateOrderStatusResponse
+{
+    bool success = 1;
+    string message = 2;
+}
+
+enum DeliveryStatus
+{
+    DELIVERY_PENDING = 0;
+    DELIVERY_PROCESSING = 1;
+    DELIVERY_SHIPPED = 2;
+    DELIVERY_DELIVERED = 3;
+    DELIVERY_CANCELLED = 4;
+}
+
+// Get Order By Id
+message GetOrderByIdRequest
+{
+    int64 order_id = 1;
+    int64 user_id = 2; // For authorization check
+}
+
+message GetOrderByIdResponse
+{
+    int64 id = 1;
+    int64 user_id = 2;
+    string order_number = 3;
+    AddressInfo address = 4;
+    int64 total_price = 5;
+    int64 discount_balance_used = 6;
+    int64 gateway_amount = 7;
+    bool payment_completed = 8;
+    google.protobuf.StringValue transaction_id = 9;
+    DeliveryStatus delivery_status = 10;
+    google.protobuf.StringValue tracking_code = 11;
+    google.protobuf.StringValue notes = 12;
+    google.protobuf.StringValue admin_notes = 13;
+    repeated OrderItemDto items = 14;
+    google.protobuf.Timestamp created = 15;
+    google.protobuf.Timestamp last_modified = 16;
+}
+
+message AddressInfo
+{
+    int64 id = 1;
+    string title = 2;
+    string address = 3;
+    string postal_code = 4;
+    google.protobuf.StringValue phone = 5;
+}
+
+message OrderItemDto
+{
+    int64 product_id = 1;
+    string product_title = 2;
+    int64 unit_price = 3;
+    int32 max_discount_percent = 4;
+    int32 count = 5;
+    int64 total_price = 6;
+    int64 discount_amount = 7;
+    int64 final_price = 8;
+}
+
+// Get User Orders
+message GetUserOrdersRequest
+{
+    int64 user_id = 1;
+    google.protobuf.BoolValue payment_completed = 2;
+    google.protobuf.Int32Value delivery_status = 3; // DeliveryStatus as int
+    int32 page_number = 4;
+    int32 page_size = 5;
+}
+
+message GetUserOrdersResponse
+{
+    messages.MetaData meta_data = 1;
+    repeated OrderSummaryDto models = 2;
+}
+
+message OrderSummaryDto
+{
+    int64 id = 1;
+    string order_number = 2;
+    int64 total_price = 3;
+    int64 discount_balance_used = 4;
+    int64 gateway_amount = 5;
+    bool payment_completed = 6;
+    DeliveryStatus delivery_status = 7;
+    google.protobuf.StringValue tracking_code = 8;
+    int32 items_count = 9;
+    google.protobuf.Timestamp created = 10;
+}