Version: 0.9.71.dev.260504

后端：
1.阶段 5 task 服务边界落地
- 新增 cmd/task 与 services/task/{dao,rpc,sv}，承载 task zrpc、tasks 表迁移和 task outbox 消费边界
- 新增 gateway/client/task、shared/contracts/task 和 task port，gateway /api/v1/task/* 切到 task zrpc client
- 将 task.urgency.promote.requested handler / relay / retry loop 迁入 cmd/task，单体 worker 不再消费 task outbox
- 保留单体 Agent 残留 task 查询的 publish-only 写入能力，避免迁移期 task 事件丢失
- active-scheduler task facts / due job scanner 切到 task RPC，并移除启动期 tasks 表依赖检查
- 更新阶段 5 文档，记录 task 切流点、旧实现保留、跨域 DB 依赖缩减和下一轮建议
- 补充 task rpc 示例配置

backend/cmd/task/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/LoveLosita/smartflow/backend/bootstrap"
+	rootdao "github.com/LoveLosita/smartflow/backend/dao"
+	kafkabus "github.com/LoveLosita/smartflow/backend/infra/kafka"
+	outboxinfra "github.com/LoveLosita/smartflow/backend/infra/outbox"
+	rootmiddleware "github.com/LoveLosita/smartflow/backend/middleware"
+	taskdao "github.com/LoveLosita/smartflow/backend/services/task/dao"
+	taskrpc "github.com/LoveLosita/smartflow/backend/services/task/rpc"
+	tasksv "github.com/LoveLosita/smartflow/backend/services/task/sv"
+	"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 := taskdao.OpenDBFromConfig()
+	if err != nil {
+		log.Fatalf("failed to connect task database: %v", err)
+	}
+	redisClient, err := taskdao.OpenRedisFromConfig()
+	if err != nil {
+		log.Fatalf("failed to connect task redis: %v", err)
+	}
+	defer redisClient.Close()
+
+	cacheRepo := rootdao.NewCacheDAO(redisClient)
+	if err := db.Use(rootmiddleware.NewGormCachePlugin(cacheRepo)); err != nil {
+		log.Fatalf("failed to initialize task cache deleter: %v", err)
+	}
+
+	taskRepo := taskdao.NewTaskDAO(db)
+	outboxRepo := outboxinfra.NewRepository(db)
+	eventBus, err := outboxinfra.NewEventBus(outboxRepo, kafkabus.LoadConfig())
+	if err != nil {
+		log.Fatalf("failed to initialize task outbox bus: %v", err)
+	}
+
+	svc := tasksv.NewTaskService(taskRepo, cacheRepo, eventBus)
+	// 迁移期 task 服务仍 best-effort 维护 active-scheduler due job，后续改成 RPC/事件后再移除该跨域 DAO。
+	svc.SetActiveScheduleDAO(rootdao.NewActiveScheduleDAO(db))
+
+	if eventBus != nil {
+		if err := tasksv.RegisterTaskUrgencyPromoteHandler(eventBus, outboxRepo, taskRepo); err != nil {
+			log.Fatalf("failed to register task outbox handler: %v", err)
+		}
+		eventBus.Start(ctx)
+		defer eventBus.Close()
+		log.Println("Task outbox consumer started")
+	} else {
+		log.Println("Task outbox consumer is disabled")
+	}
+
+	server, listenOn, err := taskrpc.NewServer(taskrpc.ServerOptions{
+		ListenOn: viper.GetString("task.rpc.listenOn"),
+		Timeout:  viper.GetDuration("task.rpc.timeout"),
+		Service:  svc,
+	})
+	if err != nil {
+		log.Fatalf("failed to build task zrpc server: %v", err)
+	}
+	defer server.Stop()
+
+	go func() {
+		log.Printf("task zrpc service starting on %s", listenOn)
+		server.Start()
+	}()
+
+	<-ctx.Done()
+	log.Println("task service stopping")
+}