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/gateway/api/notification.go

@@ -0,0 +1,128 @@
+package api
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/LoveLosita/smartflow/backend/respond"
+	contracts "github.com/LoveLosita/smartflow/backend/shared/contracts/notification"
+	"github.com/LoveLosita/smartflow/backend/shared/ports"
+	"github.com/gin-gonic/gin"
+)
+
+const notificationAPITimeout = 8 * time.Second
+
+// NotificationAPI 承载当前用户的外部通知通道配置接口。
+//
+// 职责边界：
+// 1. 只负责从 JWT 上下文取得当前 user_id、绑定请求体并调用 notification zrpc client；
+// 2. 不直接读写 user_notification_channels，避免 API 层绕过 webhook 校验和脱敏规则；
+// 3. 不参与主动调度、notification_records 状态机和 outbox 消费。
+type NotificationAPI struct {
+	client ports.NotificationCommandClient
+}
+
+func NewNotificationAPI(client ports.NotificationCommandClient) *NotificationAPI {
+	return &NotificationAPI{client: client}
+}
+
+type saveFeishuWebhookRequest struct {
+	Enabled     *bool  `json:"enabled"`
+	WebhookURL  string `json:"webhook_url" binding:"required"`
+	AuthType    string `json:"auth_type"`
+	BearerToken string `json:"bearer_token"`
+}
+
+// GetFeishuWebhook 查询当前用户的飞书 Webhook 触发器配置。
+func (api *NotificationAPI) GetFeishuWebhook(c *gin.Context) {
+	if api == nil || api.client == nil {
+		c.JSON(http.StatusInternalServerError, respond.InternalError(nilServiceError("通知通道 service 未初始化")))
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(c.Request.Context(), notificationAPITimeout)
+	defer cancel()
+
+	channel, err := api.client.GetFeishuWebhook(ctx, contracts.GetFeishuWebhookRequest{
+		UserID: c.GetInt("user_id"),
+	})
+	if err != nil {
+		respond.DealWithError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, respond.RespWithData(respond.Ok, channel))
+}
+
+// SaveFeishuWebhook 幂等保存当前用户的飞书 Webhook 触发器配置。
+func (api *NotificationAPI) SaveFeishuWebhook(c *gin.Context) {
+	if api == nil || api.client == nil {
+		c.JSON(http.StatusInternalServerError, respond.InternalError(nilServiceError("通知通道 service 未初始化")))
+		return
+	}
+
+	var req saveFeishuWebhookRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, respond.WrongParamType)
+		return
+	}
+	enabled := true
+	if req.Enabled != nil {
+		enabled = *req.Enabled
+	}
+
+	ctx, cancel := context.WithTimeout(c.Request.Context(), notificationAPITimeout)
+	defer cancel()
+
+	channel, err := api.client.SaveFeishuWebhook(ctx, contracts.SaveFeishuWebhookRequest{
+		UserID:      c.GetInt("user_id"),
+		Enabled:     enabled,
+		WebhookURL:  req.WebhookURL,
+		AuthType:    req.AuthType,
+		BearerToken: req.BearerToken,
+	})
+	if err != nil {
+		respond.DealWithError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, respond.RespWithData(respond.Ok, channel))
+}
+
+// DeleteFeishuWebhook 删除当前用户的飞书 Webhook 触发器配置。
+func (api *NotificationAPI) DeleteFeishuWebhook(c *gin.Context) {
+	if api == nil || api.client == nil {
+		c.JSON(http.StatusInternalServerError, respond.InternalError(nilServiceError("通知通道 service 未初始化")))
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(c.Request.Context(), notificationAPITimeout)
+	defer cancel()
+
+	if err := api.client.DeleteFeishuWebhook(ctx, contracts.DeleteFeishuWebhookRequest{
+		UserID: c.GetInt("user_id"),
+	}); err != nil {
+		respond.DealWithError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, respond.RespWithData(respond.Ok, gin.H{"deleted": true}))
+}
+
+// TestFeishuWebhook 发送一条最小业务 JSON 到当前用户配置的飞书 Webhook。
+func (api *NotificationAPI) TestFeishuWebhook(c *gin.Context) {
+	if api == nil || api.client == nil {
+		c.JSON(http.StatusInternalServerError, respond.InternalError(nilServiceError("通知通道 service 未初始化")))
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(c.Request.Context(), notificationAPITimeout)
+	defer cancel()
+
+	result, err := api.client.TestFeishuWebhook(ctx, contracts.TestFeishuWebhookRequest{
+		UserID: c.GetInt("user_id"),
+	})
+	if err != nil {
+		respond.DealWithError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, respond.RespWithData(respond.Ok, result))
+}