feat(runner): implement cluster mode with Redis-based task dispatching and registry

Introduce a distributed task execution system for gRPC runners. This includes:
- A `TaskBus` for cluster-mode task dispatching via Redis Pub/Sub.
- A `RunnerRegistry` to track active runner instances in Redis.
- Support for both standalone and cluster modes via configuration.
- Refactored `RunnerHub` and `TaskManager` to use a `TaskDispatcher` interface, decoupling task submission from local execution.
- Added distributed locking to `HotRankWorker` to ensure only one instance performs periodic hot rank recalculations in a multi-instance deployment.
- Updated dependency injection (Wire) to support the new runner components and registry.

internal/router/router.go

@@ -518,6 +518,7 @@ func (r *Router) setupRoutes() {
 				groups.PUT("/:id/join-type", r.groupHandler.HandleSetJoinType) // 加群方式
 				groups.PUT("/:id/name", r.groupHandler.HandleSetGroupName)     // 群名称
 				groups.PUT("/:id/avatar", r.groupHandler.HandleSetGroupAvatar) // 群头像
+				groups.PUT("/:id/description", r.groupHandler.HandleSetGroupDescription) // 群描述
 
 				// 群公告
 				groups.POST("/:id/announcements", r.groupHandler.HandleCreateAnnouncement)                    // 创建公告