feat: add batch task approval settings and fix modal dropdown scrolling

internal/database/database.go

@@ -468,6 +468,7 @@ func (db *DB) initTables() error {
 		title TEXT,
 		role TEXT,
 		agent_mode TEXT NOT NULL DEFAULT 'eino_single',
+		hitl_policy TEXT NOT NULL DEFAULT '',
 		schedule_mode TEXT NOT NULL DEFAULT 'manual',
 		cron_expr TEXT,
 		next_run_at DATETIME,
@@ -1379,6 +1380,16 @@ func (db *DB) migrateBatchTaskQueuesTable() error {
 		}
 	}
 
+	var hitlPolicyCount int
+	if err := db.QueryRow("SELECT COUNT(*) FROM pragma_table_info('batch_task_queues') WHERE name='hitl_policy'").Scan(&hitlPolicyCount); err != nil {
+		return fmt.Errorf("检查队列审批字段失败: %w", err)
+	}
+	if hitlPolicyCount == 0 {
+		if _, err := db.Exec("ALTER TABLE batch_task_queues ADD COLUMN hitl_policy TEXT NOT NULL DEFAULT ''"); err != nil {
+			return fmt.Errorf("添加队列审批字段失败: %w", err)
+		}
+	}
+
 	var concurrencyCount int
 	err = db.QueryRow("SELECT COUNT(*) FROM pragma_table_info('batch_task_queues') WHERE name='concurrency'").Scan(&concurrencyCount)
 	if err != nil {