Revert "fix: 支付分退款/查询API路径从/pay/refund改为/refund"

官方文档确认支付分退款路径就是 /pay/refund，之前的404可能是因为
支付资源未创建。代码中 /pay 调用就是为了解决这个问题。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

haha-service/src/main/java/com/haha/service/payment/payscore/impl/WxPayScoreStrategy.java

@@ -611,7 +611,7 @@ public class WxPayScoreStrategy implements PayScoreStrategy {
             body.put("amount", yuanToFen(request.getRefundAmount()));
 
             String requestBody = objectMapper.writeValueAsString(body);
-            String url = PAY_SCORE_BASE_URL + "/" + request.getOutOrderNo() + "/refund";
+            String url = PAY_SCORE_BASE_URL + "/" + request.getOutOrderNo() + "/pay/refund";
             log.info("[微信支付分] 退款请求: url={}, body={}", url, requestBody);
 
             HttpRequest httpRequest = new HttpRequest.Builder()