feat(printer):优化订单打印纸张尺寸获取逻辑

- 引入Redis缓存存储打印纸张尺寸信息
- 优先从Redis中获取纸张尺寸，减少数据库查询
- 在创建订单时将打印机偏好纸张存入Redis，有效期60秒
- 修复打印机对象作用域问题，避免空指针异常
- 统一打印机状态校验逻辑，提高代码可读性

src/main/java/com/ycwl/basic/service/pc/impl/OrderServiceImpl.java

@@ -70,6 +70,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.Scope;
 import org.springframework.context.annotation.ScopedProxyMode;
+import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -140,6 +141,8 @@ public class OrderServiceImpl implements OrderService {
     private ICouponService iCouponService;
     @Autowired
     private MemberRelationRepository memberRelationRepository;
+    @Autowired
+    private RedisTemplate<String, String> redisTemplate;
 
     @Override
     public ApiResponse<PageInfo<OrderRespVO>> pageQuery(OrderReqQuery query) {
@@ -583,9 +586,14 @@ public class OrderServiceImpl implements OrderService {
         if (orderAppRespVO != null && orderAppRespVO.getOrderItemList() != null && !orderAppRespVO.getOrderItemList().isEmpty()) {
             orderAppRespVO.getOrderItemList().forEach(orderItem -> {
                 if (orderItem.getGoodsType() == 3) {
-                    PrintTaskResp printTaskResp = printerMapper.queryTaskByMpId(Math.toIntExact(orderItem.getGoodsId()));
-                    if (printTaskResp != null) {
-                        orderItem.setPrinterPaper(printTaskResp.getPaper());
+                    String size = redisTemplate.opsForValue().get("printer_size:" + id);
+                    if (size != null) {
+                        orderItem.setPrinterPaper(size);
+                    } else {
+                        PrintTaskResp printTaskResp = printerMapper.queryTaskByMpId(Math.toIntExact(orderItem.getGoodsId()));
+                        if (printTaskResp != null) {
+                            orderItem.setPrinterPaper(printTaskResp.getPaper());
+                        }
                     }
                 }
             });