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

app/challenges/[id].tsx

@@ -19,6 +19,7 @@ import {
 } from '@/store/challengesSlice';
 import { Toast } from '@/utils/toast.utils';
 import { Ionicons } from '@expo/vector-icons';
+import dayjs from 'dayjs';
 import { BlurView } from 'expo-blur';
 import { LinearGradient } from 'expo-linear-gradient';
 import { useLocalSearchParams, useRouter } from 'expo-router';
@@ -321,25 +322,14 @@ export default function ChallengeDetailScreen() {
                 >
                   <View style={styles.progressHeaderRow}>
                     <View style={styles.progressBadgeRing}>
-                      {progress.badge ? (
-                        isHttpUrl(progress.badge) ? (
-                          <Image source={{ uri: progress.badge }} style={styles.progressBadge} />
-                        ) : (
-                          <View style={styles.progressBadgeFallback}>
-                            <Text style={styles.progressBadgeText}>{progress.badge}</Text>
-                          </View>
-                        )
-                      ) : (
                       <View style={styles.progressBadgeFallback}>
                         <Text style={styles.progressBadgeText}>打卡中</Text>
                       </View>
-                      )}
                     </View>
                     <View style={styles.progressHeadline}>
                       <Text style={styles.progressTitle}>{challenge.title}</Text>
-                      {progress.subtitle ? <Text style={styles.progressSubtitle}>{progress.subtitle}</Text> : null}
                     </View>
-                    <Text style={styles.progressRemaining}>剩余 {progress.remaining} 天</Text>
+                    <Text style={styles.progressRemaining}>剩余 {dayjs(challenge.endAt).diff(dayjs(), 'd') || 0} 天</Text>
                   </View>
 
                   <View style={styles.progressMetaRow}>
@@ -368,7 +358,7 @@ export default function ChallengeDetailScreen() {
                     })}
                   </View>
 
-                  {isJoined ? (
+                  {/* {isJoined ? (
                     <>
                       <View style={styles.progressActionsRow}>
                         <TouchableOpacity
@@ -402,7 +392,7 @@ export default function ChallengeDetailScreen() {
                         <Text style={styles.progressErrorText}>{progressActionError}</Text>
                       ) : null}
                     </>
-                  ) : null}
+                  ) : null} */}
                 </LinearGradient>
               </View>
             </View>

services/challengesApi.ts

@@ -5,9 +5,7 @@ export type ChallengeStatus = 'upcoming' | 'ongoing' | 'expired';
 export type ChallengeProgressDto = {
   completed: number;
   target: number;
-  remaining: number;
+  remaining: number
-  badge: string;
-  subtitle?: string;
 };
 
 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 & {