feat: add Z12/Z13 bind APIs, stock import, and sync docs

Enable auto default sync channels on agent activate, bind-code/phone confirm flows, publish ALTER, and align admin/yuheng docs with the production bind path.

platform/internal/meta/postgres.go

@@ -75,6 +75,29 @@ ORDER BY updated_at DESC`
 	return out, rows.Err()
 }
 
+func (s *PostgresStore) ListPublishedApps(ctx context.Context) ([]*AppRecord, error) {
+	const q = `
+SELECT app_id, tenant_id, slug, name, schema_name, COALESCE(database_name,''), engine, status,
+       blueprint_json, ddl_json, endpoints_json, error_msg, created_at, updated_at
+FROM platform_meta.tenant_apps
+WHERE status = $1
+ORDER BY tenant_id, slug`
+	rows, err := s.DB.QueryContext(ctx, q, string(StatusPublished))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make([]*AppRecord, 0)
+	for rows.Next() {
+		rec, err := scanApp(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, rec)
+	}
+	return out, rows.Err()
+}
+
 func (s *PostgresStore) Save(ctx context.Context, app *AppRecord) error {
 	if app == nil {
 		return fmt.Errorf("app is nil")