feat(order): 添加重复购买检测功能

- 新增 DuplicatePurchaseException 类用于处理重复购买异常
- 在 OrderServiceImpl 中实现重复购买检查逻辑
- 更新 CustomExceptionHandle 以处理新的重复购买异常
-优化订单创建流程，在生成订单号前增加重复购买检查

src/main/java/com/ycwl/basic/exception/CustomExceptionHandle.java

@@ -1,6 +1,7 @@
 package com.ycwl.basic.exception;
 
 import com.ycwl.basic.enums.BizCodeEnum;
+import com.ycwl.basic.order.exception.DuplicatePurchaseException;
 import com.ycwl.basic.utils.ApiResponse;
 import jakarta.servlet.http.HttpServletRequest;
 import org.apache.tomcat.util.http.fileupload.impl.SizeLimitExceededException;
@@ -106,4 +107,18 @@ public class CustomExceptionHandle {
     public ApiResponse<String> handle(SizeLimitExceededException sizeLimitExceededException) {
         return ApiResponse.buildResponse(415, "文件过大，请重新上传");
     }
+    
+    /**
+     * 重复购买异常处理
+     */
+    @ExceptionHandler(value = DuplicatePurchaseException.class)
+    public ApiResponse<String> handle(HttpServletResponse response, DuplicatePurchaseException exception) {
+        response.setStatus(HttpStatus.BAD_REQUEST.value());
+        LOGGER.warn("检测到重复购买: productType={}, productId={}, existingOrderId={}, existingOrderNo={}", 
+                   exception.getProductType(), exception.getProductId(), 
+                   exception.getExistingOrderId(), exception.getExistingOrderNo());
+        
+        // 返回友好的错误信息给前端
+        return ApiResponse.buildResponse(4001, exception.getFriendlyMessage());
+    }
 }