修复：商品描述过长导致支付失败的bug

src/test/java/com/gxwebsoft/shop/WechatPayDescriptionTest.java

@@ -19,13 +19,13 @@ public class WechatPayDescriptionTest {
     public void testTruncateToByteLimit() {
         // 测试正常情况 - 字符串长度在限制内
         String shortText = "正常商品描述";
-        String result1 = truncateToByteLimit(shortText, 127);
+        String result1 = WechatPayUtils.truncateToByteLimit(shortText, 127);
         assertEquals(shortText, result1);
         assertTrue(result1.getBytes(StandardCharsets.UTF_8).length <= 127);
 
         // 测试超长中文字符串
         String longText = "【湾区认证】【百千万工程帮扶产品 通过远方320项检测 湾区认证 丰江桥佛手瓜面】独特风味低脂轻食便捷速食非油炸 720g/袋";
-        String result2 = truncateToByteLimit(longText, 127);
+        String result2 = WechatPayUtils.truncateToByteLimit(longText, 127);
         assertNotNull(result2);
         assertTrue(result2.getBytes(StandardCharsets.UTF_8).length <= 127);
         System.out.println("原始文本字节数: " + longText.getBytes(StandardCharsets.UTF_8).length);
@@ -33,18 +33,18 @@ public class WechatPayDescriptionTest {
         System.out.println("截断后字节数: " + result2.getBytes(StandardCharsets.UTF_8).length);
 
         // 测试null和空字符串
-        assertNull(truncateToByteLimit(null, 127));
-        assertEquals("", truncateToByteLimit("", 127));
+        assertNull(WechatPayUtils.truncateToByteLimit(null, 127));
+        assertEquals("", WechatPayUtils.truncateToByteLimit("", 127));
 
         // 测试英文字符串
         String englishText = "This is a very long English description that might exceed the byte limit for WeChat Pay description field";
-        String result3 = truncateToByteLimit(englishText, 127);
+        String result3 = WechatPayUtils.truncateToByteLimit(englishText, 127);
         assertNotNull(result3);
         assertTrue(result3.getBytes(StandardCharsets.UTF_8).length <= 127);
 
         // 测试混合字符串
         String mixedText = "Product Name 产品名称 with special characters @#$%^&*()";
-        String result4 = truncateToByteLimit(mixedText, 50);
+        String result4 = WechatPayUtils.truncateToByteLimit(mixedText, 50);
         assertNotNull(result4);
         assertTrue(result4.getBytes(StandardCharsets.UTF_8).length <= 50);
     }
@@ -61,7 +61,7 @@ public class WechatPayDescriptionTest {
         assertTrue(originalBytes > 127, "原始文本应该超过127字节");
 
         // 测试截断
-        String truncated = truncateToByteLimit(errorText, 127);
+        String truncated = WechatPayUtils.processDescription(errorText);
         int truncatedBytes = truncated.getBytes(StandardCharsets.UTF_8).length;
 
         System.out.println("截断后文本: " + truncated);