feat(order): 添加支付相关接口和功能

- 新增获取支付参数接口和处理支付回调接口
- 实现支付参数获取和支付回调处理的逻辑
- 添加支付相关数据传输对象（DTO）
- 修改订单服务接口和实现类，增加支付相关方法

src/main/java/com/ycwl/basic/controller/mobile/AppOrderV2Controller.java

@@ -13,10 +13,14 @@ import com.ycwl.basic.order.service.IOrderService;
 import com.ycwl.basic.order.dto.OrderV2DetailResponse;
 import com.ycwl.basic.order.dto.OrderV2ListResponse;
 import com.ycwl.basic.order.dto.OrderV2PageRequest;
+import com.ycwl.basic.order.dto.PaymentParamsRequest;
+import com.ycwl.basic.order.dto.PaymentParamsResponse;
+import com.ycwl.basic.order.dto.PaymentCallbackResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.web.bind.annotation.*;
 
+import jakarta.servlet.http.HttpServletRequest;
 import java.math.BigDecimal;
 
 /**
@@ -142,14 +146,14 @@ public class AppOrderV2Controller {
         
         if (cachedResult == null) {
             log.warn("移动端下单：价格缓存已过期或不存在, userId={}, scenicId={}", currentUserId, scenicId);
-            return ApiResponse.fail("价格信息已过期，请重新查询价格后再下单");
+            return ApiResponse.fail("请重新下单！");
         }
         
         // 验证价格是否匹配
         if (cachedResult.getFinalAmount().compareTo(request.getExpectedFinalAmount()) != 0) {
             log.warn("移动端下单：价格不匹配, cached={}, expected={}, userId={}, scenicId={}", 
                     cachedResult.getFinalAmount(), request.getExpectedFinalAmount(), currentUserId, scenicId);
-            return ApiResponse.fail("价格信息不匹配，请重新查询价格后再下单");
+            return ApiResponse.fail("请重新下单！");
         }
         
         // 验证原价是否匹配（可选）
@@ -239,4 +243,62 @@ public class AppOrderV2Controller {
             return ApiResponse.fail("查询失败：" + e.getMessage());
         }
     }
+    
+    // ====== 支付相关接口 ======
+    
+    /**
+     * 获取订单支付参数
+     * 用于小程序调起支付
+     */
+    @PostMapping("/{orderId}/payment-params")
+    public ApiResponse<PaymentParamsResponse> getPaymentParams(
+            @PathVariable("orderId") Long orderId,
+            @RequestBody PaymentParamsRequest request) {
+        
+        String currentUserIdStr = BaseContextHandler.getUserId();
+        if (currentUserIdStr == null) {
+            log.warn("用户未登录");
+            return ApiResponse.fail("用户未登录");
+        }
+        
+        Long currentUserId = Long.valueOf(currentUserIdStr);
+        
+        log.info("获取支付参数: userId={}, orderId={}", currentUserId, orderId);
+        
+        try {
+            PaymentParamsResponse response = orderService.getPaymentParams(orderId, currentUserId, request);
+            return ApiResponse.success(response);
+        } catch (Exception e) {
+            log.error("获取支付参数失败: userId={}, orderId={}", currentUserId, orderId, e);
+            return ApiResponse.fail(e.getMessage());
+        }
+    }
+    
+    /**
+     * 支付回调处理接口
+     * 供第三方支付平台回调使用
+     */
+    @PostMapping("/payment/callback/{scenicId}")
+    public String handlePaymentCallback(
+            @PathVariable("scenicId") Long scenicId,
+            HttpServletRequest request) {
+        
+        log.info("接收支付回调: scenicId={}", scenicId);
+        
+        try {
+            PaymentCallbackResponse response = orderService.handlePaymentCallback(scenicId, request);
+            
+            if (response.isSuccess()) {
+                log.info("支付回调处理成功: scenicId={}, orderId={}, statusChangeType={}", 
+                        scenicId, response.getOrderId(), response.getStatusChangeType());
+                return "SUCCESS"; // 返回给第三方支付平台的成功标识
+            } else {
+                log.error("支付回调处理失败: scenicId={}, message={}", scenicId, response.getMessage());
+                return "FAIL"; // 返回给第三方支付平台的失败标识
+            }
+        } catch (Exception e) {
+            log.error("支付回调异常: scenicId={}", scenicId, e);
+            return "FAIL";
+        }
+    }
 }