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/grpc/runner/server.go

@@ -23,12 +23,11 @@ type Server struct {
 	grpcSrv *grpc.Server
 }
 
-// NewServer 创建新的 gRPC 服务器
+// NewServer 创建新的 gRPC 服务器（内部构造 Hub + TaskManager）
 func NewServer(cfg *config.GRPCConfig, logger *zap.Logger) *Server {
-	// 创建 TaskManager 和 RunnerHub，解决循环依赖
 	taskManager := NewTaskManager(nil, 60*time.Second, logger)
 	hub := NewRunnerHub(taskManager, logger)
-	taskManager.SetHub(hub)
+	taskManager.SetDispatcher(hub)
 
 	return &Server{
 		cfg:    cfg,
@@ -37,6 +36,15 @@ func NewServer(cfg *config.GRPCConfig, logger *zap.Logger) *Server {
 	}
 }
 
+// NewServerWithDeps 使用外部依赖创建 gRPC 服务器（Wire DI 使用）
+func NewServerWithDeps(cfg *config.GRPCConfig, logger *zap.Logger, hub *RunnerHub) *Server {
+	return &Server{
+		cfg:    cfg,
+		logger: logger,
+		hub:    hub,
+	}
+}
+
 // Start 启动 gRPC 服务器
 func (s *Server) Start() error {
 	if !s.cfg.Enabled {