feat(subscription): 订阅过期状态自动更新与服务端排序

- 新增 SubscriptionExpiryService 定时任务，每分钟更新过期订阅状态
- 订阅列表支持服务端排序（按过期时间、状态、创建时间）
- 实时显示正确的过期状态，无需等待定时任务
- 允许对已过期订阅进行续期操作
- DataTable 组件支持 serverSideSort 模式

backend/internal/service/subscription_expiry_service.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"context"
+	"log"
+	"sync"
+	"time"
+)
+
+// SubscriptionExpiryService periodically updates expired subscription status.
+type SubscriptionExpiryService struct {
+	userSubRepo UserSubscriptionRepository
+	interval    time.Duration
+	stopCh      chan struct{}
+	stopOnce    sync.Once
+	wg          sync.WaitGroup
+}
+
+func NewSubscriptionExpiryService(userSubRepo UserSubscriptionRepository, interval time.Duration) *SubscriptionExpiryService {
+	return &SubscriptionExpiryService{
+		userSubRepo: userSubRepo,
+		interval:    interval,
+		stopCh:      make(chan struct{}),
+	}
+}
+
+func (s *SubscriptionExpiryService) Start() {
+	if s == nil || s.userSubRepo == nil || s.interval <= 0 {
+		return
+	}
+	s.wg.Add(1)
+	go func() {
+		defer s.wg.Done()
+		ticker := time.NewTicker(s.interval)
+		defer ticker.Stop()
+
+		s.runOnce()
+		for {
+			select {
+			case <-ticker.C:
+				s.runOnce()
+			case <-s.stopCh:
+				return
+			}
+		}
+	}()
+}
+
+func (s *SubscriptionExpiryService) Stop() {
+	if s == nil {
+		return
+	}
+	s.stopOnce.Do(func() {
+		close(s.stopCh)
+	})
+	s.wg.Wait()
+}
+
+func (s *SubscriptionExpiryService) runOnce() {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	updated, err := s.userSubRepo.BatchUpdateExpiredStatus(ctx)
+	if err != nil {
+		log.Printf("[SubscriptionExpiry] Update expired subscriptions failed: %v", err)
+		return
+	}
+	if updated > 0 {
+		log.Printf("[SubscriptionExpiry] Updated %d expired subscriptions", updated)
+	}
+}

backend/internal/service/subscription_service.go

@@ -330,12 +330,10 @@ func (s *SubscriptionService) ExtendSubscription(ctx context.Context, subscripti
 		newExpiresAt = MaxExpiresAt
 	}
 
-	// 如果是缩短（负数），检查新的过期时间必须大于当前时间
-	if days < 0 {
-		now := time.Now()
-		if !newExpiresAt.After(now) {
-			return nil, ErrAdjustWouldExpire
-		}
+	// 检查新的过期时间必须大于当前时间
+	now := time.Now()
+	if !newExpiresAt.After(now) {
+		return nil, ErrAdjustWouldExpire
 	}
 
 	if err := s.userSubRepo.ExtendExpiry(ctx, subscriptionID, newExpiresAt); err != nil {
@@ -383,6 +381,7 @@ func (s *SubscriptionService) ListUserSubscriptions(ctx context.Context, userID
 		return nil, err
 	}
 	normalizeExpiredWindows(subs)
+	normalizeSubscriptionStatus(subs)
 	return subs, nil
 }
 
@@ -404,17 +403,19 @@ func (s *SubscriptionService) ListGroupSubscriptions(ctx context.Context, groupI
 		return nil, nil, err
 	}
 	normalizeExpiredWindows(subs)
+	normalizeSubscriptionStatus(subs)
 	return subs, pag, nil
 }
 
-// List 获取所有订阅（分页，支持筛选）
-func (s *SubscriptionService) List(ctx context.Context, page, pageSize int, userID, groupID *int64, status string) ([]UserSubscription, *pagination.PaginationResult, error) {
+// List 获取所有订阅（分页，支持筛选和排序）
+func (s *SubscriptionService) List(ctx context.Context, page, pageSize int, userID, groupID *int64, status, sortBy, sortOrder string) ([]UserSubscription, *pagination.PaginationResult, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
-	subs, pag, err := s.userSubRepo.List(ctx, params, userID, groupID, status)
+	subs, pag, err := s.userSubRepo.List(ctx, params, userID, groupID, status, sortBy, sortOrder)
 	if err != nil {
 		return nil, nil, err
 	}
 	normalizeExpiredWindows(subs)
+	normalizeSubscriptionStatus(subs)
 	return subs, pag, nil
 }
 
@@ -441,6 +442,18 @@ func normalizeExpiredWindows(subs []UserSubscription) {
 	}
 }
 
+// normalizeSubscriptionStatus 根据实际过期时间修正状态（仅影响返回数据，不影响数据库）
+// 这确保前端显示正确的状态，即使定时任务尚未更新数据库
+func normalizeSubscriptionStatus(subs []UserSubscription) {
+	now := time.Now()
+	for i := range subs {
+		sub := &subs[i]
+		if sub.Status == SubscriptionStatusActive && !sub.ExpiresAt.After(now) {
+			sub.Status = SubscriptionStatusExpired
+		}
+	}
+}
+
 // startOfDay 返回给定时间所在日期的零点（保持原时区）
 func startOfDay(t time.Time) time.Time {
 	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
@@ -659,11 +672,6 @@ func (s *SubscriptionService) GetUserSubscriptionsWithProgress(ctx context.Conte
 	return progresses, nil
 }
 
-// UpdateExpiredSubscriptions 更新过期订阅状态（定时任务调用）
-func (s *SubscriptionService) UpdateExpiredSubscriptions(ctx context.Context) (int64, error) {
-	return s.userSubRepo.BatchUpdateExpiredStatus(ctx)
-}
-
 // ValidateSubscription 验证订阅是否有效
 func (s *SubscriptionService) ValidateSubscription(ctx context.Context, sub *UserSubscription) error {
 	if sub.Status == SubscriptionStatusExpired {

backend/internal/service/user_subscription_port.go

@@ -18,7 +18,7 @@ type UserSubscriptionRepository interface {
 	ListByUserID(ctx context.Context, userID int64) ([]UserSubscription, error)
 	ListActiveByUserID(ctx context.Context, userID int64) ([]UserSubscription, error)
 	ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]UserSubscription, *pagination.PaginationResult, error)
-	List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status string) ([]UserSubscription, *pagination.PaginationResult, error)
+	List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status, sortBy, sortOrder string) ([]UserSubscription, *pagination.PaginationResult, error)
 
 	ExistsByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (bool, error)
 	ExtendExpiry(ctx context.Context, subscriptionID int64, newExpiresAt time.Time) error

backend/internal/service/wire.go

@@ -72,6 +72,13 @@ func ProvideAccountExpiryService(accountRepo AccountRepository) *AccountExpirySe
 	return svc
 }
 
+// ProvideSubscriptionExpiryService creates and starts SubscriptionExpiryService.
+func ProvideSubscriptionExpiryService(userSubRepo UserSubscriptionRepository) *SubscriptionExpiryService {
+	svc := NewSubscriptionExpiryService(userSubRepo, time.Minute)
+	svc.Start()
+	return svc
+}
+
 // ProvideTimingWheelService creates and starts TimingWheelService
 func ProvideTimingWheelService() (*TimingWheelService, error) {
 	svc, err := NewTimingWheelService()
@@ -256,6 +263,7 @@ var ProviderSet = wire.NewSet(
 	ProvideUpdateService,
 	ProvideTokenRefreshService,
 	ProvideAccountExpiryService,
+	ProvideSubscriptionExpiryService,
 	ProvideTimingWheelService,
 	ProvideDashboardAggregationService,
 	ProvideUsageCleanupService,