refactor(paging): 重构分页查询使用 PageHelper

-将 MyBatis-Plus 的分页插件替换为 PageHelper
- 更新了相关控制器、服务接口和实现类中的分页查询方法
- 优化了分页查询的逻辑，提高了代码的可读性和维护性

src/main/java/com/ycwl/basic/pricing/controller/VoucherUsageController.java

@@ -1,6 +1,6 @@
 package com.ycwl.basic.pricing.controller;
 
-import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.github.pagehelper.PageInfo;
 import com.ycwl.basic.utils.ApiResponse;
 import com.ycwl.basic.pricing.dto.req.VoucherUsageHistoryReq;
 import com.ycwl.basic.pricing.dto.resp.VoucherUsageRecordResp;
@@ -24,9 +24,9 @@ public class VoucherUsageController {
     private final IVoucherUsageService voucherUsageService;
 
     @PostMapping("/history")
-    public ApiResponse<Page<VoucherUsageRecordResp>> getUsageHistory(@RequestBody VoucherUsageHistoryReq req) {
+    public ApiResponse<PageInfo<VoucherUsageRecordResp>> getUsageHistory(@RequestBody VoucherUsageHistoryReq req) {
         try {
-            Page<VoucherUsageRecordResp> result = voucherUsageService.getUsageHistory(req);
+            PageInfo<VoucherUsageRecordResp> result = voucherUsageService.getUsageHistory(req);
             return ApiResponse.success(result);
         } catch (Exception e) {
             log.error("查询券码使用记录失败", e);