feat: generate order number

server/routers/dry-wash/model/order.js

@@ -27,6 +27,11 @@ const schema = new Schema({
         type: String,
         required: true
     },
+    orderNumber: {
+        type: String,
+        required: true,
+        unique: true
+    },
     status: {
         type: String,
         required: true,