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/application/runtime/evaluation.go

@@ -23,10 +23,10 @@ type OfflineEvaluationCase struct {
 }
 
 type OfflineEvaluationResult struct {
-	CaseID      string `json:"caseId"`
+	CaseID      string `json:"case_id"`
 	Category    string `json:"category"`
 	Passed      bool   `json:"passed"`
-	ReplyText   string `json:"replyText"`
+	ReplyText   string `json:"reply_text"`
 	Interrupted bool   `json:"interrupted"`
 	Error       string `json:"error,omitempty"`
 	Finding     string `json:"finding,omitempty"`
@@ -87,7 +87,7 @@ func (r *OfflineEvaluationRunner) Run(ctx context.Context, agent models.AIAgent,
 func (r OfflineEvaluationReport) CSV() (string, error) {
 	var output strings.Builder
 	writer := csv.NewWriter(&output)
-	if err := writer.Write([]string{"caseId", "category", "passed", "interrupted", "finding", "error", "replyText"}); err != nil {
+	if err := writer.Write([]string{"case_id", "category", "passed", "interrupted", "finding", "error", "reply_text"}); err != nil {
 		return "", err
 	}
 	for _, item := range r.Results {
@@ -103,10 +103,10 @@ func evaluateOfflineCase(expect map[string]any, summary *RunResult) (bool, strin
 	if summary == nil || strings.TrimSpace(summary.ReplyText) == "" {
 		return false, "empty_reply"
 	}
-	if requiresConfirmation, _ := expect["requiresConfirmation"].(bool); requiresConfirmation && !summary.Interrupted {
+	if requiresConfirmation, _ := expect["requires_confirmation"].(bool); requiresConfirmation && !summary.Interrupted {
 		return false, "confirmation_not_reached"
 	}
-	if maxWrites, ok := evaluationExpectationInt(expect["maxWriteToolCalls"]); ok {
+	if maxWrites, ok := evaluationExpectationInt(expect["max_write_tool_calls"]); ok {
 		if maxWrites < 0 {
 			return false, "invalid_expectation"
 		}
@@ -137,7 +137,7 @@ func writeToolCalls(summary *RunResult) int {
 	count := 0
 	for _, code := range summary.InvokedToolCodes {
 		switch toolx.NormalizeToolCodeAlias(code) {
-		case toolx.GraphCreateTicketConfirm.Code, toolx.GraphHandoffConversation.Code:
+		case toolx.GraphHandoffConversation.Code:
 			count++
 		}
 	}