feat(timer): 新增配置同步到数据库及主节点选举

T5: TimerServiceBase.syncConfigToDatabase() - syncs task config to DB
T6: HostServiceBase - auto master election, stale node detection,
    getMasterNode/setMasterNode methods

extend/base/common/service/TimerServiceBase.php

@@ -2,12 +2,69 @@
 
 namespace base\common\service;
 
+use app\admin\model\SystemTimerConfig;
 use app\common\model\VirtualModel;
 
 class TimerServiceBase
 {
     protected $taskList = null;
 
+    /**
+     * 将配置文件中的定时任务同步到数据库.
+     * 仅新增不存在的记录，标记孤立记录，不覆盖 run_type/status.
+     */
+    public static function syncConfigToDatabase(): void
+    {
+        $config_list = include app_file_path('common/command/timer/config.php');
+
+        // 提取唯一的任务名称（并发扩展会产生同名配置，需去重）
+        $config_names = [];
+        foreach ($config_list as $config_item) {
+            $item = static::initConfigItem($config_item);
+            $name = (string) $item['name'];
+            if ($name !== '' && !in_array($name, $config_names, true)) {
+                $config_names[] = $name;
+            }
+        }
+
+        // 查询已有记录
+        $existing = SystemTimerConfig::column('task_name');
+        $now = time();
+
+        // 新增：配置中有但数据库中没有的
+        $new_names = array_diff($config_names, $existing);
+        foreach ($new_names as $name) {
+            SystemTimerConfig::create([
+                'task_name' => $name,
+                'run_type' => 'auto',
+                'status' => 1,
+                'is_synced' => 1,
+                'create_time' => $now,
+                'update_time' => $now,
+            ]);
+        }
+
+        // 已存在且仍在配置中：仅更新 is_synced=1，不动 run_type/status
+        $still_exists = array_intersect($existing, $config_names);
+        foreach ($still_exists as $name) {
+            SystemTimerConfig::where('task_name', $name)
+                ->update([
+                    'is_synced' => 1,
+                    'update_time' => $now,
+                ]);
+        }
+
+        // 已存在但不在配置中：标记为孤立
+        $orphaned = array_diff($existing, $config_names);
+        foreach ($orphaned as $name) {
+            SystemTimerConfig::where('task_name', $name)
+                ->update([
+                    'is_synced' => 0,
+                    'update_time' => $now,
+                ]);
+        }
+    }
+
     public static function generateAllTaskInstanceList()
     {
         $config_list = include app_file_path('common/command/timer/config.php');