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

plugins/sehuatang_push/main.py

@@ -0,0 +1,127 @@
+# -*- coding: utf-8 -*-
+import asyncio
+from typing import Any, Dict, List, Optional, Tuple
+
+from base.plugin_common.message_plugin_interface import MessagePluginInterface
+from base.plugin_common.plugin_interface import PluginStatus
+from utils.sehuatang.shehuatang import pdf_file_path
+from utils.sehuatang.shehuatang_undetected import pdf_file_path_undetected
+
+
+class SehuatangPushPlugin(MessagePluginInterface):
+    """涩图 PDF 推送插件。"""
+
+    FEATURE_KEY = "PDF_CAPABILITY"
+    FEATURE_DESCRIPTION = "📄 sehuatang PDF能力 [无]"
+
+    @property
+    def name(self) -> str:
+        return "涩图推送"
+
+    @property
+    def version(self) -> str:
+        return "1.0.0"
+
+    @property
+    def description(self) -> str:
+        return "将 sehuatang PDF 推送从系统任务迁移到插件任务。"
+
+    @property
+    def author(self) -> str:
+        return "ABOT Team"
+
+    @property
+    def commands(self) -> List[str]:
+        return []
+
+    @property
+    def feature_key(self) -> Optional[str]:
+        return self.FEATURE_KEY
+
+    @property
+    def feature_description(self) -> Optional[str]:
+        return self.FEATURE_DESCRIPTION
+
+    def __init__(self):
+        super().__init__()
+        self.feature = self.register_feature()
+
+    def initialize(self, context: Dict[str, Any]) -> bool:
+        return True
+
+    def start(self) -> bool:
+        self.status = PluginStatus.RUNNING
+        return True
+
+    def stop(self) -> bool:
+        self.status = PluginStatus.STOPPED
+        return True
+
+    def can_process(self, message: Dict[str, Any]) -> bool:
+        return False
+
+    async def process_message(self, message: Dict[str, Any]) -> Tuple[bool, Optional[str]]:
+        return False, None
+
+    def get_schedule_actions(self) -> List[Dict[str, Any]]:
+        return [
+            {
+                "action_key": "daily_pdf_push",
+                "name": "涩图PDF推送",
+                "description": "每天生成并推送涩图 PDF 提醒",
+                "trigger_type": "at_times",
+                "trigger_config": {"time_list": ["15:30"]},
+                "target_scope": "all_enabled_groups",
+                "target_config": {},
+                "payload": {"at_user": "Jyunere"},
+                "default_enabled": True,
+            }
+        ]
+
+    async def run_scheduled_action(self, action_key: str, context: Dict[str, Any]) -> Dict[str, Any]:
+        if action_key != "daily_pdf_push":
+            return {
+                "success": False,
+                "summary": f"不支持的动作: {action_key}",
+                "detail": {"action_key": action_key},
+            }
+        if not self.bot:
+            return {"success": False, "summary": "bot 未注入", "detail": {}}
+
+        target_groups = [str(g).strip() for g in (context.get("target_groups") or []) if str(g).strip()]
+        if not target_groups:
+            return {"success": False, "summary": "没有可推送目标群", "detail": {"target_count": 0}}
+
+        payload = context.get("payload") or {}
+        at_user = str(payload.get("at_user", "Jyunere") or "Jyunere").strip()
+
+        # 兼容历史逻辑：优先使用 undetected 方案，失败后回退普通抓取。
+        try:
+            ok, path = await asyncio.to_thread(pdf_file_path_undetected)
+            if not ok:
+                ok, path = await asyncio.to_thread(pdf_file_path)
+            if not ok:
+                return {"success": False, "summary": "PDF 生成失败", "detail": {}}
+        except Exception as e:
+            return {"success": False, "summary": f"PDF 生成异常: {e}", "detail": {"error": str(e)}}
+
+        success_groups = []
+        failed_groups = {}
+        for gid in target_groups:
+            try:
+                # 历史系统任务仅发送提醒文本，这里保持一致，避免引入文件发送兼容风险。
+                await self.bot.send_at_message(gid, f"98堂 PDF已就绪，请手动发送\n文件: {path}", [at_user])
+                success_groups.append(gid)
+            except Exception as e:
+                failed_groups[gid] = str(e)
+
+        return {
+            "success": len(failed_groups) == 0,
+            "summary": f"涩图推送完成: 成功{len(success_groups)}群, 失败{len(failed_groups)}群",
+            "detail": {
+                "target_count": len(target_groups),
+                "success_groups": success_groups,
+                "failed_groups": failed_groups,
+                "pdf_path": path,
+            },
+        }