refactor: 将客服后端重构为宿主可嵌入模块

- 注入数据库、运行时配置、统一响应、文件存储和平台 AI 能力，补充业务读写工具与客户快捷操作契约。

- 移除模块内重复的组织、客户、工单、标签、技能、旧工作流、MCP 和迁移实现，将身份权限与业务主体交由宿主管理。

- 使用 libSQL 重构向量存储，并完善图片消息、访客身份、排队调度、企业微信和支持聊天页面。

- 统一 HTTP、DTO 与 WebSocket 的 snake_case 协议，补齐模块初始化、业务动作和公共载荷等回归测试。

internal/services/conversation_interrupt_service.go

@@ -98,8 +98,6 @@ func (s *conversationInterruptService) mergeForCheckpointUpdate(current, next *m
 	merged.AgentStepID = current.AgentStepID
 	merged.SourceMessageID = current.SourceMessageID
 	merged.LastResumeMessageID = current.LastResumeMessageID
-	merged.WorkflowRunID = current.WorkflowRunID
-	merged.WorkflowNodeID = current.WorkflowNodeID
 	merged.InterruptID = current.InterruptID
 	merged.InterruptType = current.InterruptType
 	merged.Status = current.Status
@@ -125,8 +123,6 @@ func (s *conversationInterruptService) mergeForPendingUpdate(current, next *mode
 	merged.AgentRunID = next.AgentRunID
 	merged.AgentStepID = next.AgentStepID
 	merged.SourceMessageID = next.SourceMessageID
-	merged.WorkflowRunID = next.WorkflowRunID
-	merged.WorkflowNodeID = next.WorkflowNodeID
 	merged.InterruptID = next.InterruptID
 	merged.InterruptType = next.InterruptType
 	merged.Status = next.Status