新增商家，商家名称重复校验

src/main/java/com/chelvc/cloud/maintain/controller/UserCouponController.java

@@ -43,7 +43,7 @@ public class UserCouponController {
      */
     @PostMapping("/usercoupon/{couponId}/claim")
     public Long claimCoupon(@PathVariable("couponId") @Min(value = 1, message = "优惠券主键不能小于1") Long couponId) {
-        return this.userCouponService.addUserCoupon(param);
+        return this.userCouponService.claimCoupon(couponId);
     }
 
     /**