feat(challenges): 移除进度徽章与副标题并动态计算剩余天数

- 使用 dayjs 实时计算挑战结束剩余天数，替代接口返回的固定值
- 删除 badge、subtitle 字段及相关渲染逻辑，简化 UI
- 注释掉未使用的打卡操作区块，保持界面整洁

services/challengesApi.ts

@@ -5,9 +5,7 @@ export type ChallengeStatus = 'upcoming' | 'ongoing' | 'expired';
 export type ChallengeProgressDto = {
   completed: number;
   target: number;
-  remaining: number;
-  badge: string;
-  subtitle?: string;
+  remaining: number
 };
 
 export type RankingItemDto = {
@@ -35,6 +33,7 @@ export type ChallengeListItemDto = {
   isJoined: boolean;
   startAt?: string;
   endAt?: string;
+  minimumCheckInDays: number; // 最小打卡天数
 };
 
 export type ChallengeDetailDto = ChallengeListItemDto & {