refactor: 重构项目结构，将Result类及相关工具类移动到dto和util包

将Result类从common包移动到dto包，ResultUtils类从common包移动到util包
调整所有相关文件的import语句以匹配新的包结构
新增CorsConfig配置类处理跨域请求
优化AuthController的登录接口返回统一响应格式

src/main/java/com/qf/backend/controller/RefundsController.java

@@ -0,0 +1,158 @@
+package com.qf.backend.controller;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.security.access.prepost.PreAuthorize;
+
+import com.qf.backend.dto.Result;
+import com.qf.backend.entity.Refunds;
+import com.qf.backend.service.RefundsService;
+import java.util.List;
+
+/**
+ * 退款控制器
+ * 处理退款相关的HTTP请求
+ * 遵循RESTful API设计规范
+ */
+@RequestMapping("/api/refunds")
+@RestController
+public class RefundsController {
+    private static final Logger logger = LoggerFactory.getLogger(RefundsController.class);
+    
+    @Autowired
+    private RefundsService refundsService;
+    
+    /**
+     * 根据订单ID查询退款记录
+     * @param orderId 订单ID
+     * @return 退款记录列表
+     */
+    @GetMapping("/order/{orderId}")
+    public Result<List<Refunds>> getRefundsByOrderId(@PathVariable Long orderId) {
+        logger.info("根据订单ID查询退款记录，订单ID：{}", orderId);
+        List<Refunds> refunds = refundsService.getRefundsByOrderId(orderId);
+        return Result.success(refunds);
+    }
+    
+    /**
+     * 根据退款单号查询退款记录
+     * @param refundNumber 退款单号
+     * @return 退款记录
+     */
+    @GetMapping("/number/{refundNumber}")
+    public Result<Refunds> getRefundByNumber(@PathVariable String refundNumber) {
+        logger.info("根据退款单号查询退款记录，退款单号：{}", refundNumber);
+        Refunds refund = refundsService.getRefundByNumber(refundNumber);
+        return Result.success(refund);
+    }
+    
+    /**
+     * 创建退款记录
+     * @param refunds 退款信息
+     * @return 是否成功
+     */
+    @PostMapping("/create")
+    @PreAuthorize("hasRole('ROLE_ADMIN') or hasRole('ROLE_USER')")
+    public Result<Boolean> createRefund(@RequestBody Refunds refunds) {
+        logger.info("创建退款记录，退款信息：{}", refunds);
+        boolean result = refundsService.createRefund(refunds);
+        return Result.success(result);
+    }
+    
+    /**
+     * 更新退款信息
+     * @param refunds 退款信息
+     * @return 是否成功
+     */
+    @PutMapping("/update")
+    @PreAuthorize("hasRole('ROLE_ADMIN')")
+    public Result<Boolean> updateRefund(@RequestBody Refunds refunds) {
+        logger.info("更新退款信息，退款信息：{}", refunds);
+        boolean result = refundsService.updateRefund(refunds);
+        return Result.success(result);
+    }
+    
+    /**
+     * 删除退款记录
+     * @param id 退款ID
+     * @return 是否成功
+     */
+    @DeleteMapping("/delete/{id}")
+    @PreAuthorize("hasRole('ROLE_ADMIN')")
+    public Result<Boolean> deleteRefund(@PathVariable Long id) {
+        logger.info("删除退款记录，退款ID：{}", id);
+        boolean result = refundsService.deleteRefund(id);
+        return Result.success(result);
+    }
+    
+    /**
+     * 根据退款ID查询退款记录
+     * @param id 退款ID
+     * @return 退款记录
+     */
+    @GetMapping("/{id}")
+    public Result<Refunds> getRefundById(@PathVariable Long id) {
+        logger.info("根据退款ID查询退款记录，退款ID：{}", id);
+        Refunds refund = refundsService.getRefundById(id);
+        return Result.success(refund);
+    }
+    
+    /**
+     * 根据用户ID查询退款记录
+     * @param userId 用户ID
+     * @return 退款记录列表
+     */
+    @GetMapping("/user/{userId}")
+    public Result<List<Refunds>> getRefundsByUserId(@PathVariable Long userId) {
+        logger.info("根据用户ID查询退款记录，用户ID：{}", userId);
+        List<Refunds> refunds = refundsService.getRefundsByUserId(userId);
+        return Result.success(refunds);
+    }
+    
+    /**
+     * 根据退款状态查询退款记录
+     * @param status 退款状态
+     * @return 退款记录列表
+     */
+    @GetMapping("/status/{status}")
+    public Result<List<Refunds>> getRefundsByStatus(@PathVariable Integer status) {
+        logger.info("根据退款状态查询退款记录，状态：{}", status);
+        List<Refunds> refunds = refundsService.getRefundsByStatus(status);
+        return Result.success(refunds);
+    }
+    
+    /**
+     * 更新退款状态
+     * @param refundId 退款ID
+     * @param status 退款状态
+     * @return 是否成功
+     */
+    @PutMapping("/update-status/{refundId}/{status}")
+    @PreAuthorize("hasRole('ROLE_ADMIN')")
+    public Result<Boolean> updateRefundStatus(@PathVariable Long refundId, @PathVariable Integer status) {
+        logger.info("更新退款状态，退款ID：{}，状态：{}", refundId, status);
+        boolean result = refundsService.updateRefundStatus(refundId, status);
+        return Result.success(result);
+    }
+    
+    /**
+     * 分页查询退款记录
+     * @param page 当前页码
+     * @param size 每页数量
+     * @return 退款记录列表
+     */
+    @GetMapping("/page/{page}/{size}")
+    public Result<List<Refunds>> listRefundsByPage(@PathVariable int page, @PathVariable int size) {
+        logger.info("分页查询退款记录，页码：{}，每页数量：{}", page, size);
+        List<Refunds> refunds = refundsService.listRefundsByPage(page, size);
+        return Result.success(refunds);
+    }
+}