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/cmd/active-scheduler/main.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/LoveLosita/smartflow/backend/bootstrap"
+	kafkabus "github.com/LoveLosita/smartflow/backend/infra/kafka"
+	"github.com/LoveLosita/smartflow/backend/inits"
+	activeschedulerdao "github.com/LoveLosita/smartflow/backend/services/active_scheduler/dao"
+	activeschedulerrpc "github.com/LoveLosita/smartflow/backend/services/active_scheduler/rpc"
+	activeschedulersv "github.com/LoveLosita/smartflow/backend/services/active_scheduler/sv"
+	llmservice "github.com/LoveLosita/smartflow/backend/services/llm"
+	"github.com/spf13/viper"
+)
+
+func main() {
+	if err := bootstrap.LoadConfig(); err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	db, err := activeschedulerdao.OpenDBFromConfig()
+	if err != nil {
+		log.Fatalf("failed to connect active-scheduler database: %v", err)
+	}
+
+	aiHub, err := inits.InitEino()
+	if err != nil {
+		log.Fatalf("failed to initialize active-scheduler Eino runtime: %v", err)
+	}
+	llmService := llmservice.New(llmservice.Options{
+		AIHub:             aiHub,
+		APIKey:            os.Getenv("ARK_API_KEY"),
+		BaseURL:           viper.GetString("agent.baseURL"),
+		CourseVisionModel: viper.GetString("courseImport.visionModel"),
+	})
+
+	svc, err := activeschedulersv.New(db, llmService, activeschedulersv.Options{
+		JobScanEvery: viper.GetDuration("activeScheduler.jobScanEvery"),
+		JobScanLimit: viper.GetInt("activeScheduler.jobScanLimit"),
+		KafkaConfig:  kafkabus.LoadConfig(),
+	})
+	if err != nil {
+		log.Fatalf("failed to initialize active-scheduler service: %v", err)
+	}
+	defer svc.Close()
+	svc.StartWorkers(ctx)
+	log.Println("Active-scheduler outbox consumer and due job scanner started")
+
+	server, listenOn, err := activeschedulerrpc.NewServer(activeschedulerrpc.ServerOptions{
+		ListenOn: viper.GetString("activeScheduler.rpc.listenOn"),
+		Timeout:  viper.GetDuration("activeScheduler.rpc.timeout"),
+		Service:  svc,
+	})
+	if err != nil {
+		log.Fatalf("failed to build active-scheduler zrpc server: %v", err)
+	}
+	defer server.Stop()
+
+	go func() {
+		log.Printf("active-scheduler zrpc service starting on %s", listenOn)
+		server.Start()
+	}()
+
+	<-ctx.Done()
+	log.Println("active-scheduler service stopping")
+}