feat(ECR-025): OpsCMS FeedSlot 只读并 Closed

栏目位目录（ops_feed_slots + /cms），复用 admin.cms.read。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/internal/service/admin/cms.go

@@ -11,6 +11,7 @@ import (
 )
 
 var ErrBannerNotFound = errString("banner not found")
+var ErrFeedSlotNotFound = errString("feed slot not found")
 
 // ListBanners returns OpsCMS Banner catalog.
 func (s *Service) ListBanners(ctx context.Context) ([]repository.BannerRow, error) {
@@ -32,3 +33,24 @@ func (s *Service) GetBanner(ctx context.Context, id uuid.UUID) (*repository.Bann
 	}
 	return row, err
 }
+
+// ListFeedSlots returns OpsCMS FeedSlot catalog.
+func (s *Service) ListFeedSlots(ctx context.Context) ([]repository.FeedSlotRow, error) {
+	items, err := s.Repo.ListFeedSlots(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if items == nil {
+		items = []repository.FeedSlotRow{}
+	}
+	return items, nil
+}
+
+// GetFeedSlot loads one feed slot.
+func (s *Service) GetFeedSlot(ctx context.Context, id uuid.UUID) (*repository.FeedSlotRow, error) {
+	row, err := s.Repo.GetFeedSlot(ctx, id)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, ErrFeedSlotNotFound
+	}
+	return row, err
+}