feat: Add ClearCart command and response, implement CancelOrder command with validation, and enhance DeliveryStatus and User models

src/CMSMicroservice.Protobuf/Protos/userorder.proto

@@ -49,6 +49,12 @@ service UserOrderContract
             body: "*"
         };
     };
+    rpc CancelOrder(CancelOrderRequest) returns (CancelOrderResponse){
+        option (google.api.http) = {
+            post: "/CancelOrder"
+            body: "*"
+        };
+    };
 }
 message CreateNewUserOrderRequest
 {
@@ -225,3 +231,19 @@ message SubmitShopBuyOrderResponse
 {
     int64 id = 1;
 }
+
+// CancelOrder Messages
+message CancelOrderRequest
+{
+    int64 order_id = 1;
+    string cancel_reason = 2;
+    bool refund_payment = 3;
+}
+
+message CancelOrderResponse
+{
+    int64 order_id = 1;
+    messages.DeliveryStatus status = 2;
+    string message = 3;
+    bool refund_processed = 4;
+}