feat(challenges): 支持公开访问挑战列表与详情接口

- 在 GET /challenges、GET /challenges/:id、GET /challenges/:id/rankings 添加 @Public() 装饰器，允许未登录用户访问
- 将 userId 改为可选参数，未登录时仍可返回基础数据
- 列表接口过滤掉 UPCOMING 状态挑战，仅展示进行中/已结束
- 返回 DTO 新增 unit 字段，用于前端展示进度单位
- 鉴权守卫优化：公开接口若携带 token 仍尝试解析并注入 user，方便后续业务逻辑

src/challenges/challenges.service.ts

@@ -28,7 +28,7 @@ export class ChallengesService {
     private readonly progressReportModel: typeof ChallengeProgressReport,
   ) { }
 
-  async getChallengesForUser(userId: string): Promise<ChallengeListItemDto[]> {
+  async getChallengesForUser(userId?: string): Promise<ChallengeListItemDto[]> {
     const challenges = await this.challengeModel.findAll({
       order: [['startAt', 'ASC']],
     });
@@ -50,6 +50,7 @@ export class ChallengesService {
         challenge,
         status: this.computeStatus(challenge.startAt, challenge.endAt),
       }))
+      .filter(({ status }) => status !== ChallengeStatus.UPCOMING)
       .sort((a, b) => {
         const priorityDiff = statusPriority[a.status] - statusPriority[b.status];
         if (priorityDiff !== 0) {
@@ -81,19 +82,22 @@ export class ChallengesService {
       }
     }
 
-    const userParticipations = await this.participantModel.findAll({
-      where: {
-        challengeId: challengeIds,
-        userId,
-        status: {
-          [Op.ne]: ChallengeParticipantStatus.LEFT,
-        },
-      },
-    });
-
     const participationMap = new Map<string, ChallengeParticipant>();
-    for (const participation of userParticipations) {
-      participationMap.set(participation.challengeId, participation);
+
+    if (userId) {
+      const userParticipations = await this.participantModel.findAll({
+        where: {
+          challengeId: challengeIds,
+          userId,
+          status: {
+            [Op.ne]: ChallengeParticipantStatus.LEFT,
+          },
+        },
+      });
+
+      for (const participation of userParticipations) {
+        participationMap.set(participation.challengeId, participation);
+      }
     }
 
     return challengesWithStatus.map(({ challenge, status }) => {
@@ -111,6 +115,7 @@ export class ChallengesService {
         durationLabel: challenge.durationLabel,
         requirementLabel: challenge.requirementLabel,
         status,
+        unit: challenge.progressUnit,
         startAt: challenge.startAt,
         endAt: challenge.endAt,
         participantsCount: participantsCountMap.get(challenge.id) ?? 0,
@@ -126,7 +131,7 @@ export class ChallengesService {
     });
   }
 
-  async getChallengeDetail(userId: string, challengeId: string): Promise<ChallengeDetailDto> {
+  async getChallengeDetail(challengeId: string, userId?: string,): Promise<ChallengeDetailDto> {
     const challenge = await this.challengeModel.findByPk(challengeId);
 
     if (!challenge) {
@@ -147,15 +152,17 @@ export class ChallengesService {
           status: ChallengeParticipantStatus.ACTIVE,
         },
       }),
-      this.participantModel.findOne({
-        where: {
-          challengeId,
-          userId,
-          status: {
-            [Op.ne]: ChallengeParticipantStatus.LEFT,
+      userId
+        ? this.participantModel.findOne({
+          where: {
+            challengeId,
+            userId,
+            status: {
+              [Op.ne]: ChallengeParticipantStatus.LEFT,
+            },
           },
-        },
-      }),
+        })
+        : null,
     ]);
 
     this.winstonLogger.info('end get detail', {
@@ -205,6 +212,7 @@ export class ChallengesService {
       progress,
       rankings,
       userRank,
+      unit: challenge.progressUnit,
       type: challenge.type,
     };
   }