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/ai/runtime/reply_helpers_test.go

@@ -24,11 +24,10 @@ func TestExtractInterruptMessageAndCheckpointError(t *testing.T) {
 	}
 }
 
-func TestBuildConversationInterruptStoresWorkflowCheckpointData(t *testing.T) {
+func TestBuildConversationInterruptStoresCheckpointData(t *testing.T) {
 	item := buildConversationInterrupt(testConversation(1), testMessage(2), testAIAgent(3), &applicationruntime.RunResult{
 		CheckPointData: `{"confirmNodeId":"confirm_1"}`,
 		Interrupted:    true,
-		WorkflowRunID:  99,
 		AgentRunID:     88,
 		Interrupts: []applicationruntime.InterruptContextSummary{
 			{Type: "human_confirm", ID: "confirm_1", InfoPreview: `{"message":"请确认"}`},
@@ -40,8 +39,8 @@ func TestBuildConversationInterruptStoresWorkflowCheckpointData(t *testing.T) {
 	if item.RequestData != `{"confirmNodeId":"confirm_1"}` {
 		t.Fatalf("unexpected request data: %q", item.RequestData)
 	}
-	if item.WorkflowRunID != 99 || item.AgentRunID != 88 || item.WorkflowNodeID != "confirm_1" {
-		t.Fatalf("unexpected workflow interrupt identity: run=%d node=%q", item.WorkflowRunID, item.WorkflowNodeID)
+	if item.AgentRunID != 88 || item.InterruptID != "confirm_1" {
+		t.Fatalf("unexpected interrupt identity: run=%d interrupt=%q", item.AgentRunID, item.InterruptID)
 	}
 }