fix: 修复标签打印功能中'打印份数'参数未生效的问题

inventory-backend/app/services/print/label_service.py

@@ -275,6 +275,11 @@ class LabelPrintService:
         ip = config['ip']
         port = config['port']
 
+        # 获取打印份数，默认为 1
+        copies = data.get('copies', 1)
+        if copies < 1:
+            copies = 1
+
         try:
             # 1. 获取 RGB 图像
             img_rgb = LabelPrintService._create_image_object(data)
@@ -301,7 +306,7 @@ class LabelPrintService:
 
             # 位图指令
             bitmap_cmd = f"BITMAP 0,0,{width_bytes},{height_dots},0,".encode('gbk')
-            footer = b"\r\nPRINT 1,1\r\n"
+            footer = f"\r\nPRINT 1,{copies}\r\n".encode('gbk')
 
             # 5. 发送 socket
             s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)