Version: 0.9.69.dev.260504

后端：
1. 阶段 4 active-scheduler 服务边界落地，新增 `cmd/active-scheduler`、`services/active_scheduler`、`shared/contracts/activescheduler` 和 active-scheduler port，迁移 dry-run、trigger、preview、confirm zrpc 能力
2. active-scheduler outbox consumer、relay、retry loop 和 due job scanner 迁入独立服务入口，gateway `/active-schedule/*` 改为通过 zrpc client 调用
3. gateway 目录收口为 `gateway/api` + `gateway/client`，统一归档 userauth、notification、active-scheduler 的 HTTP 门面和 zrpc client
4. 将旧 `backend/active_scheduler` 领域核心下沉到 `services/active_scheduler/core`，清退旧根目录活跃实现，并补充 active-scheduler 启动期跨域依赖表检查
5. 调整单体启动与 outbox 归属，`cmd/all` 不再启动 active-scheduler workflow、scanner 或 handler

文档：
1. 更新微服务迁移计划，将阶段 4 active-scheduler 标记为首轮收口完成，并明确下一阶段进入 schedule / task / course / task-class

backend/services/active_scheduler/rpc/server.go

@@ -0,0 +1,60 @@
+package rpc
+
+import (
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/LoveLosita/smartflow/backend/services/active_scheduler/rpc/pb"
+	activeschedulersv "github.com/LoveLosita/smartflow/backend/services/active_scheduler/sv"
+	"github.com/zeromicro/go-zero/core/service"
+	"github.com/zeromicro/go-zero/zrpc"
+	"google.golang.org/grpc"
+)
+
+const (
+	defaultListenOn = "0.0.0.0:9083"
+	defaultTimeout  = 8 * time.Second
+)
+
+type ServerOptions struct {
+	ListenOn string
+	Timeout  time.Duration
+	Service  *activeschedulersv.Service
+}
+
+// NewServer 创建 active-scheduler zrpc 服务端。
+//
+// 职责边界：
+// 1. 只负责 zrpc server 配置与 gRPC handler 注册；
+// 2. 不创建数据库、LLM、outbox 或 worker，它们由 cmd/active-scheduler 管理；
+// 3. 返回 listenOn 供进程入口打印启动日志。
+func NewServer(opts ServerOptions) (*zrpc.RpcServer, string, error) {
+	if opts.Service == nil {
+		return nil, "", errors.New("active-scheduler service dependency not initialized")
+	}
+
+	listenOn := strings.TrimSpace(opts.ListenOn)
+	if listenOn == "" {
+		listenOn = defaultListenOn
+	}
+	timeout := opts.Timeout
+	if timeout <= 0 {
+		timeout = defaultTimeout
+	}
+
+	server, err := zrpc.NewServer(zrpc.RpcServerConf{
+		ServiceConf: service.ServiceConf{
+			Name: "active-scheduler.rpc",
+			Mode: service.DevMode,
+		},
+		ListenOn: listenOn,
+		Timeout:  int64(timeout / time.Millisecond),
+	}, func(grpcServer *grpc.Server) {
+		pb.RegisterActiveSchedulerServer(grpcServer, NewHandler(opts.Service))
+	})
+	if err != nil {
+		return nil, "", err
+	}
+	return server, listenOn, nil
+}