feat(ECR-026): OpsCMS ScheduledPublication 只读并 Closed

定时发布目录（ops_scheduled_publications），并加固 catalog 生成器。

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

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

@@ -0,0 +1,34 @@
+package admin
+
+import (
+	"context"
+	"errors"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+
+	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
+)
+
+var ErrScheduledPublicationNotFound = errString("scheduled publication not found")
+
+// ListScheduledPublications returns catalog.
+func (s *Service) ListScheduledPublications(ctx context.Context) ([]repository.ScheduledPublicationRow, error) {
+	items, err := s.Repo.ListScheduledPublications(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if items == nil {
+		items = []repository.ScheduledPublicationRow{}
+	}
+	return items, nil
+}
+
+// GetScheduledPublication loads one.
+func (s *Service) GetScheduledPublication(ctx context.Context, id uuid.UUID) (*repository.ScheduledPublicationRow, error) {
+	row, err := s.Repo.GetScheduledPublication(ctx, id)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, ErrScheduledPublicationNotFound
+	}
+	return row, err
+}