Version: 0.9.77.dev.260505

后端：
1.阶段 6 CP4/CP5 目录收口与共享边界纯化
- 将 backend 根目录收口为 services、client、gateway、cmd、shared 五个一级目录
- 收拢 bootstrap、inits、infra/kafka、infra/outbox、conv、respond、pkg、middleware，移除根目录旧实现与空目录
- 将 utils 下沉到 services/userauth/internal/auth，将 logic 下沉到 services/schedule/core/planning
- 将迁移期 runtime 桥接实现统一收拢到 services/runtime/{conv,dao,eventsvc,model}，删除 shared/legacy 与未再被 import 的旧 service 实现
- 将 gateway/shared/respond 收口为 HTTP/Gin 错误写回适配，shared/respond 仅保留共享错误语义与状态映射
- 将 HTTP IdempotencyMiddleware 与 RateLimitMiddleware 收口到 gateway/middleware
- 将 GormCachePlugin 下沉到 shared/infra/gormcache，将共享 RateLimiter 下沉到 shared/infra/ratelimit，将 agent token budget 下沉到 services/agent/shared
- 删除 InitEino 兼容壳，收缩 cmd/internal/coreinit 仅保留旧组合壳残留域初始化语义
- 更新微服务迁移计划与桌面 checklist，补齐 CP4/CP5 当前切流点、目录终态与验证结果
- 完成 go test ./...、git diff --check 与最终真实 smoke；health、register/login、task/create+get、schedule/today、task-class/list、memory/items、agent chat/meta/timeline/context-stats 全部 200，SSE 合并结果为 CP5_OK 且 [DONE] 只有 1 个

backend/services/runtime/conv/task.go

@@ -0,0 +1,94 @@
+package conv
+
+import (
+	"time"
+
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
+)
+
+func UserAddTaskRequestToModel(request *model.UserAddTaskRequest, userID int) *model.Task {
+	return &model.Task{
+		Title:              request.Title,
+		Priority:           request.PriorityGroup,
+		EstimatedSections:  model.NormalizeEstimatedSections(&request.EstimatedSections),
+		DeadlineAt:         request.DeadlineAt,
+		UrgencyThresholdAt: request.UrgencyThresholdAt,
+		UserID:             userID,
+	}
+}
+
+func ModelToUserAddTaskResponse(task *model.Task) *model.UserAddTaskResponse {
+	status := "incomplete"
+	if task.IsCompleted {
+		status = "completed"
+	}
+	return &model.UserAddTaskResponse{
+		ID:                task.ID,
+		Title:             task.Title,
+		PriorityGroup:     task.Priority,
+		EstimatedSections: model.NormalizeEstimatedSections(&task.EstimatedSections),
+		DeadlineAt:        task.DeadlineAt,
+		Status:            status,
+		CreatedAt:         time.Now(), // 创建时间使用当前服务时间，保持既有响应语义。
+	}
+}
+
+func ModelToGetUserTasksResp(tasks []model.Task) []model.GetUserTaskResp {
+	var resp []model.GetUserTaskResp
+	for _, task := range tasks {
+		status := "incomplete"
+		if task.IsCompleted {
+			status = "completed"
+		}
+
+		deadline := ""
+		if task.DeadlineAt != nil {
+			deadline = task.DeadlineAt.Format("2006-01-02 15:04:05")
+		}
+
+		urgencyThreshold := ""
+		if task.UrgencyThresholdAt != nil {
+			urgencyThreshold = task.UrgencyThresholdAt.Format("2006-01-02 15:04:05")
+		}
+
+		resp = append(resp, model.GetUserTaskResp{
+			ID:                 task.ID,
+			UserID:             task.UserID,
+			Title:              task.Title,
+			PriorityGroup:      task.Priority,
+			EstimatedSections:  model.NormalizeEstimatedSections(&task.EstimatedSections),
+			Status:             status,
+			Deadline:           deadline,
+			IsCompleted:        task.IsCompleted,
+			UrgencyThresholdAt: urgencyThreshold,
+		})
+	}
+	return resp
+}
+
+// ModelToGetUserTaskResp 将单个 Task 模型转换为 GetUserTaskResp。
+func ModelToGetUserTaskResp(task *model.Task) model.GetUserTaskResp {
+	status := "incomplete"
+	if task.IsCompleted {
+		status = "completed"
+	}
+	deadline := ""
+	if task.DeadlineAt != nil {
+		deadline = task.DeadlineAt.Format("2006-01-02 15:04:05")
+	}
+	urgencyThreshold := ""
+	if task.UrgencyThresholdAt != nil {
+		urgencyThreshold = task.UrgencyThresholdAt.Format("2006-01-02 15:04:05")
+	}
+	return model.GetUserTaskResp{
+		ID:                 task.ID,
+		UserID:             task.UserID,
+		Title:              task.Title,
+		PriorityGroup:      task.Priority,
+		EstimatedSections:  model.NormalizeEstimatedSections(&task.EstimatedSections),
+		Status:             status,
+		Deadline:           deadline,
+		IsCompleted:        task.IsCompleted,
+		UrgencyThresholdAt: urgencyThreshold,
+	}
+}