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/agent.go

@@ -0,0 +1,52 @@
+package conv
+
+import (
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
+	"github.com/cloudwego/eino/schema"
+)
+
+// ToEinoMessages 将数据库模型转换为 Eino 模型
+func ToEinoMessages(dbMsgs []model.ChatHistory) []*schema.Message {
+	res := make([]*schema.Message, 0)
+	for _, m := range dbMsgs {
+		var role schema.RoleType
+		switch safeChatHistoryRole(m.Role) {
+		case "user":
+			role = schema.User
+		case "assistant":
+			role = schema.Assistant
+		default:
+			role = schema.System
+		}
+		msg := &schema.Message{
+			Role:             role,
+			Content:          safeChatHistoryText(m.MessageContent),
+			ReasoningContent: safeChatHistoryText(m.ReasoningContent),
+		}
+		// retry 机制已整体下线：历史数据里的 retry_* 列不再回灌到运行期上下文。
+		extra := make(map[string]any)
+		extra["history_id"] = m.ID
+		if m.ReasoningDurationSeconds > 0 {
+			extra["reasoning_duration_seconds"] = m.ReasoningDurationSeconds
+		}
+		if len(extra) > 0 {
+			msg.Extra = extra
+		}
+		res = append(res, msg)
+	}
+	return res
+}
+
+func safeChatHistoryRole(role *string) string {
+	if role == nil {
+		return ""
+	}
+	return *role
+}
+
+func safeChatHistoryText(text *string) string {
+	if text == nil {
+		return ""
+	}
+	return *text
+}