系统业务任务插件化迁移：下沉7项非刚需任务并接入平滑迁移

- 系统任务保留刚需三项：登录巡检、消息计数入库、媒体补偿处理；移除新闻/Epic/排行/PDF/秀人维护等业务型系统任务定义\n- 新增 daily_news、epic_free、daily_ranking、sehuatang_push 四个插件，将原系统业务任务改为插件可调度动作\n- 扩展 xiuren_image 插件调度动作，新增秀人下载、绅士R15下载、图片缓存更新三项维护任务\n- 新增系统任务到插件任务的幂等迁移逻辑：按旧 job_key 映射到插件 action，同步 trigger_type/trigger_config/enabled，并通过 payload 标记防止反复覆盖\n- 在 Robot 启动流程中接入迁移执行与重载，并清理已迁移的历史系统任务记录，避免后台双份维护\n- 扩展插件调度数据库操作：支持按 plugin_name + action_key 精确查询，便于迁移与对账

utils/plugin_schedule_manager.py

@@ -23,6 +23,60 @@ class PluginScheduleManager:
         self.db.init_tables()
         self.reload_from_db()
 
+    def migrate_from_system_jobs(self, system_job_db) -> Dict[str, int]:
+        """把历史系统任务配置迁移到插件任务表（幂等）。"""
+        # 迁移映射：旧 system_job_key -> (插件显示名, 插件动作 key)
+        migration_map = {
+            "news_baidu_report_auto": ("每日新闻", "baidu_news_daily_push"),
+            "epic_free_games": ("Epic播报", "weekly_free_games_push"),
+            "message_ranking_push": ("每日排行", "daily_message_ranking_push"),
+            "sehuatang_pdf_push": ("涩图推送", "daily_pdf_push"),
+            "xiuren_download": ("秀人图片", "resource_xiuren_download"),
+            "shenshi_r15_download": ("秀人图片", "resource_shenshi_r15_download"),
+            "update_image_cache": ("秀人图片", "resource_update_image_cache"),
+        }
+
+        migrated = 0
+        skipped = 0
+        failed = 0
+        for job_key, target in migration_map.items():
+            plugin_name, action_key = target
+            try:
+                sys_row = system_job_db.get_job(job_key)
+                if not sys_row:
+                    skipped += 1
+                    continue
+                schedule_row = self.db.get_schedule_by_plugin_action(plugin_name, action_key)
+                if not schedule_row:
+                    skipped += 1
+                    continue
+
+                # 通过 payload 标记是否已经迁移，避免每次启动覆盖用户后续修改。
+                payload = schedule_row.get("payload") or {}
+                if payload.get("_migrated_from_system_job") == job_key:
+                    skipped += 1
+                    continue
+
+                payload["_migrated_from_system_job"] = job_key
+                updates = {
+                    "trigger_type": sys_row.get("trigger_type", schedule_row.get("trigger_type")),
+                    "trigger_config": sys_row.get("trigger_config") or schedule_row.get("trigger_config") or {},
+                    "enabled": bool(sys_row.get("enabled", 1)),
+                    "payload": payload,
+                }
+                # 名称/描述尽量沿用用户在插件端的展示，但允许继承旧系统任务描述。
+                if sys_row.get("description"):
+                    updates["description"] = sys_row.get("description")
+                if self.db.update_schedule(int(schedule_row["id"]), updates):
+                    migrated += 1
+                else:
+                    failed += 1
+            except Exception as e:
+                failed += 1
+                logger.error(f"系统任务迁移到插件任务失败: job_key={job_key}, error={e}")
+
+        return {"migrated": migrated, "skipped": skipped, "failed": failed}
+
     def _get_plugin_actions(self) -> List[Dict[str, Any]]:
         actions = []
         for plugin in self.plugin_manager.plugins.values():