将@关系批处理业务迁移到 value_rank 插件

- 从 MessageStorageDB 移除@抽取与社交图写入逻辑，消息层仅保留归档职责

- 从系统级任务移除 process_pending_mentions，取消 message_to_db 中对应入口

- 在 value_rank 插件新增定时动作 value_rank_mentions_extract（每10分钟）

- 在插件内实现窗口化批处理（默认10~20分钟前）、@提取、幂等写入明细/边表/日汇总及 unique_interactors 回填

- 新增插件侧可配置参数 mention_batch_size / mention_window_start_minutes / mention_window_end_minutes

utils/system_jobs.py

@@ -43,14 +43,6 @@ def get_system_job_definitions(robot) -> List[Dict[str, Any]]:
             "trigger_config": {"seconds": 300},
             "handler": _build_process_pending_images_handler(robot),
         },
-        {
-            "job_key": "process_pending_mentions",
-            "name": "待抽取@关系处理",
-            "description": "每 10 分钟处理一次待抽取@消息并更新社交图",
-            "trigger_type": "every_seconds",
-            "trigger_config": {"seconds": 600},
-            "handler": _build_process_pending_mentions_handler(robot),
-        },
     ]
 
 def _build_process_pending_images_handler(robot) -> Callable[[], Awaitable[None]]:
@@ -61,18 +53,6 @@ def _build_process_pending_images_handler(robot) -> Callable[[], Awaitable[None]
     return _handler
 
 
-def _build_process_pending_mentions_handler(robot) -> Callable[[], Awaitable[None]]:
-    async def _handler():
-        if hasattr(robot, "message_storage") and robot.message_storage:
-            await robot.message_storage.process_pending_mentions(
-                batch_size=200,
-                window_start_minutes=20,
-                window_end_minutes=10,
-            )
-
-    return _handler
-
-
 class SystemJobLoader:
     """系统任务加载器：从数据库读取调度配置并注册到 async_job。"""