feat(coupon): 添加景区ID过滤功能以查询用户可用优惠券

- 在getUserCoupons接口中添加scenicId参数支持
- 修改couponService实现以按景区ID过滤优惠券
- 添加空值检查跳过无效配置的优惠券
- 更新接口文档添加scenicId参数说明

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

@@ -58,13 +58,13 @@ public class PriceCalculationController {
      * 查询用户可用优惠券（包含领取记录信息）
      */
     @GetMapping("/coupons/my-coupons")
-    public ApiResponse<List<UserCouponResp>> getUserCoupons() {
+    public ApiResponse<List<UserCouponResp>> getUserCoupons(@RequestParam(required = false) String scenicId) {
         Long userId = getUserId();
         if (userId == null) {
             return ApiResponse.fail("用户未登录");
         }
 
-        List<UserCouponResp> coupons = couponService.getUserAvailableCoupons(userId);
+        List<UserCouponResp> coupons = couponService.getUserAvailableCoupons(userId, scenicId);
 
         return ApiResponse.success(coupons);
     }

src/main/java/com/ycwl/basic/pricing/service/ICouponService.java

@@ -59,9 +59,10 @@ public interface ICouponService {
      * 查询用户可用优惠券（包含领取记录信息）
      *
      * @param userId 用户ID
+     * @param scenicId 景区ID，传入时仅返回该景区可用的优惠券，NULL时返回全部
      * @return 用户优惠券列表（包含领取记录+优惠券配置）
      */
-    List<UserCouponResp> getUserAvailableCoupons(Long userId);
+    List<UserCouponResp> getUserAvailableCoupons(Long userId, String scenicId);
     
     /**
      * 领取优惠券（内部调用方法）

src/main/java/com/ycwl/basic/pricing/service/impl/CouponServiceImpl.java

@@ -295,15 +295,19 @@ public class CouponServiceImpl implements ICouponService {
     }
     
     @Override
-    public List<UserCouponResp> getUserAvailableCoupons(Long userId) {
+    public List<UserCouponResp> getUserAvailableCoupons(Long userId, String scenicId) {
         List<PriceCouponClaimRecord> records = couponClaimRecordMapper.selectUserAvailableCoupons(userId);
         List<UserCouponResp> coupons = new ArrayList<>();
 
         for (PriceCouponClaimRecord record : records) {
             PriceCouponConfig config = couponConfigMapper.selectById(record.getCouponId());
-            if (config != null) {
+            if (config == null) {
-                coupons.add(buildUserCouponResp(record, config));
+                continue;
             }
+            if (scenicId != null && config.getScenicId() != null && !scenicId.equals(config.getScenicId())) {
+                continue;
+            }
+            coupons.add(buildUserCouponResp(record, config));
         }
 
         return coupons;