Version: 0.9.70.dev.260504

后端：
1. 阶段 5 schedule 首刀服务化落地，新增 `cmd/schedule`、`services/schedule/{dao,rpc,sv,core}`、`gateway/client/schedule`、`shared/contracts/schedule` 和 schedule port
2. gateway `/api/v1/schedule/*` 切到 schedule zrpc client，HTTP 门面只保留鉴权、参数绑定、超时和轻量转发
3. active-scheduler 的 schedule facts、feedback 和 confirm apply 改为调用 schedule RPC adapter，减少对 `schedule_events`、`schedules`、`task_classes`、`task_items` 的跨域 DB 依赖
4. 单体聊天主动调度 rerun 的 schedule 读写链路切到 schedule RPC，迁移期仅保留 task facts 直读 Gorm
5. 为 schedule zrpc 补充 `Ping` 启动健康检查，并在 gateway client 与 active-scheduler adapter 初始化时校验服务可用
6. `cmd/schedule` 独立初始化 DB / Redis，只 AutoMigrate schedule 自有表，并显式检查迁移期 task / task-class 依赖表
7. 更新 active-scheduler 依赖表检查和 preview confirm apply 抽象，保留旧 Gorm 实现作为迁移期回退路径
8. 补充 `schedule.rpc` 示例配置和 schedule HTTP RPC 超时配置

文档：
1. 更新微服务迁移计划，将阶段 5 schedule 首刀进展、当前切流点、旧实现保留范围和 active-scheduler DB 依赖收缩情况写入基线

backend/services/schedule/rpc/errors.go

@@ -0,0 +1,113 @@
+package rpc
+
+import (
+	"errors"
+	"log"
+	"strings"
+
+	"github.com/LoveLosita/smartflow/backend/respond"
+	"github.com/LoveLosita/smartflow/backend/services/schedule/core/applyadapter"
+	"google.golang.org/genproto/googleapis/rpc/errdetails"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+const (
+	scheduleErrorDomain      = "smartflow.schedule"
+	scheduleApplyErrorDomain = "smartflow.schedule.apply"
+)
+
+// grpcErrorFromServiceError 负责把 schedule 内部错误转换为 gRPC status。
+//
+// 职责边界：
+// 1. apply 业务错误保留错误码，供 active-scheduler 反解后继续按原 confirm 语义处理；
+// 2. respond.Response 继续传输项目内部 status/info；
+// 3. 未分类错误只暴露通用内部错误，详细信息留在服务日志。
+func grpcErrorFromServiceError(err error) error {
+	if err == nil {
+		return nil
+	}
+	var applyErr *applyadapter.ApplyError
+	if errors.As(err, &applyErr) {
+		return grpcErrorFromApplyError(applyErr)
+	}
+	var resp respond.Response
+	if errors.As(err, &resp) {
+		return grpcErrorFromResponse(resp)
+	}
+	log.Printf("schedule rpc internal error: %v", err)
+	return status.Error(codes.Internal, "schedule service internal error")
+}
+
+func grpcErrorFromApplyError(applyErr *applyadapter.ApplyError) error {
+	if applyErr == nil {
+		return status.Error(codes.Internal, "schedule apply error")
+	}
+	message := strings.TrimSpace(applyErr.Message)
+	if message == "" {
+		message = strings.TrimSpace(applyErr.Code)
+	}
+	st := status.New(grpcCodeFromApplyErrorCode(applyErr.Code), message)
+	detail := &errdetails.ErrorInfo{
+		Domain: scheduleApplyErrorDomain,
+		Reason: applyErr.Code,
+		Metadata: map[string]string{
+			"info": message,
+		},
+	}
+	withDetails, err := st.WithDetails(detail)
+	if err != nil {
+		return st.Err()
+	}
+	return withDetails.Err()
+}
+
+func grpcErrorFromResponse(resp respond.Response) error {
+	code := grpcCodeFromRespondStatus(resp.Status)
+	message := strings.TrimSpace(resp.Info)
+	if message == "" {
+		message = strings.TrimSpace(resp.Status)
+	}
+	st := status.New(code, message)
+	detail := &errdetails.ErrorInfo{
+		Domain: scheduleErrorDomain,
+		Reason: resp.Status,
+		Metadata: map[string]string{
+			"info": resp.Info,
+		},
+	}
+	withDetails, err := st.WithDetails(detail)
+	if err != nil {
+		return st.Err()
+	}
+	return withDetails.Err()
+}
+
+func grpcCodeFromApplyErrorCode(code string) codes.Code {
+	switch strings.TrimSpace(code) {
+	case applyadapter.ErrorCodeTargetNotFound:
+		return codes.NotFound
+	case applyadapter.ErrorCodeDBError:
+		return codes.Internal
+	case applyadapter.ErrorCodeTargetCompleted,
+		applyadapter.ErrorCodeTargetAlreadyScheduled,
+		applyadapter.ErrorCodeSlotConflict:
+		return codes.FailedPrecondition
+	default:
+		return codes.InvalidArgument
+	}
+}
+
+func grpcCodeFromRespondStatus(statusValue string) codes.Code {
+	switch strings.TrimSpace(statusValue) {
+	case respond.MissingToken.Status, respond.InvalidToken.Status, respond.InvalidClaims.Status,
+		respond.ErrUnauthorized.Status, respond.WrongTokenType.Status, respond.UserLoggedOut.Status:
+		return codes.Unauthenticated
+	case respond.MissingParam.Status, respond.WrongParamType.Status, respond.ParamTooLong.Status:
+		return codes.InvalidArgument
+	}
+	if strings.HasPrefix(strings.TrimSpace(statusValue), "5") {
+		return codes.Internal
+	}
+	return codes.InvalidArgument
+}