feat(puzzle): 优化二维码生成与去重逻辑

- 避免重复上传已存在的微信小程序二维码
- 在去重检测中跳过 dateStr 字段以提高准确性
- 添加文件存在性检查，减少不必要的上传操作
- 记录并返回已存在文件的访问 URL
- 提升 puzzle 服务的性能与资源利用率

src/main/java/com/ycwl/basic/puzzle/service/impl/PuzzleGenerateServiceImpl.java

@@ -348,10 +348,12 @@ public class PuzzleGenerateServiceImpl implements IPuzzleGenerateService {
 
             // 上传到OSS
             try (FileInputStream fis = new FileInputStream(qrcode)) {
-                String fileName = String.format("qrcode_%d_%s.jpg",
-                        faceId,
-                        UUID.randomUUID().toString().replace("-", "").substring(0, 16));
-
+                String fileName = String.format("qrcode_%d.jpg", faceId);
+                boolean exists = StorageFactory.use().isExists("puzzle", "wechat_qrcode", fileName);
+                if (exists) {
+                    log.debug("微信小程序二维码已存在, 不重复上传: faceId={}, url={}", faceId, StorageFactory.use().getUrl("puzzle", "wechat_qrcode", fileName));
+                    return StorageFactory.use().getUrl("puzzle", "wechat_qrcode", fileName);
+                }
                 return StorageFactory.use().uploadFile(
                         "image/jpeg",
                         fis,