fix(cf): PromotionTierService.refreshRate 无匹配时重置 tier 为 R0

cfc-backend/src/main/java/com/etotem/cfc/service/PromotionTierService.java

@@ -102,6 +102,7 @@ public class PromotionTierService {
                 pt.setTier(tier.getTierName());
                 pt.setRatePercent(tier.getRatePercent());
             } else {
+                pt.setTier("R0");
                 pt.setRatePercent(0);
             }
             pt.setUpdatedAt(new Date());