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/graphs/analyze_conversation_graph.go

@@ -7,26 +7,26 @@ import (
 	"strings"
 
 	"code.tczkiot.com/wlw/ai-agent/internal/models"
+	"code.tczkiot.com/wlw/ai-agent/internal/pkg/enums"
 	"code.tczkiot.com/wlw/ai-agent/internal/services"
 )
 
 type AnalyzeConversationInput struct {
 	Goal              string `json:"goal"`
-	ObservedIssue     string `json:"observedIssue"`
-	NeedTicket        bool   `json:"needTicket"`
-	NeedHumanHandoff  bool   `json:"needHumanHandoff"`
-	NeedQualityCheck  bool   `json:"needQualityCheck"`
-	AdditionalContext string `json:"additionalContext"`
+	ObservedIssue     string `json:"observed_issue"`
+	NeedHumanHandoff  bool   `json:"need_human_handoff"`
+	NeedQualityCheck  bool   `json:"need_quality_check"`
+	AdditionalContext string `json:"additional_context"`
 }
 
 type AnalyzeConversationResult struct {
 	Summary               string   `json:"summary"`
-	UserIntent            string   `json:"userIntent"`
-	RiskLevel             string   `json:"riskLevel"`
-	RiskSignals           []string `json:"riskSignals,omitempty"`
-	RecommendedNextAction string   `json:"recommendedNextAction"`
-	RecommendedQuestions  []string `json:"recommendedQuestions,omitempty"`
-	ConversationFacts     []string `json:"conversationFacts,omitempty"`
+	UserIntent            string   `json:"user_intent"`
+	RiskLevel             string   `json:"risk_level"`
+	RiskSignals           []string `json:"risk_signals,omitempty"`
+	RecommendedNextAction string   `json:"recommended_next_action"`
+	RecommendedQuestions  []string `json:"recommended_questions,omitempty"`
+	ConversationFacts     []string `json:"conversation_facts,omitempty"`
 }
 
 type AnalyzeConversationGraph struct {
@@ -130,9 +130,6 @@ func collectRiskSignals(joined string, input AnalyzeConversationInput) []string
 	if containsAny(joined, "人工", "转人工", "真人", "客服") || input.NeedHumanHandoff {
 		add("handoff_requested")
 	}
-	if containsAny(joined, "工单", "报障", "售后", "登记", "记录问题") || input.NeedTicket {
-		add("ticket_expected")
-	}
 	if input.NeedQualityCheck {
 		add("quality_review_requested")
 	}
@@ -143,8 +140,6 @@ func detectUserIntent(joined string, input AnalyzeConversationInput) string {
 	switch {
 	case input.NeedHumanHandoff || containsAny(joined, "人工", "转人工", "真人"):
 		return "handoff_request"
-	case input.NeedTicket || containsAny(joined, "工单", "报障", "售后", "登记问题"):
-		return "ticket_request"
 	case containsAny(joined, "投诉", "举报", "差评", "赔偿"):
 		return "complaint"
 	default:
@@ -171,8 +166,6 @@ func recommendNextAction(intent string, signals []string, input AnalyzeConversat
 		return "quality_review"
 	case containsSignal(signals, "handoff_requested") || intent == "handoff_request":
 		return "handoff_to_human"
-	case containsSignal(signals, "ticket_expected") || intent == "ticket_request":
-		return "prepare_ticket"
 	case containsSignal(signals, "complaint_escalation"):
 		return "handoff_to_human"
 	default:
@@ -182,9 +175,6 @@ func recommendNextAction(intent string, signals []string, input AnalyzeConversat
 
 func recommendQuestions(intent string, signals []string, input AnalyzeConversationInput) []string {
 	questions := make([]string, 0, 3)
-	if containsSignal(signals, "ticket_expected") && strings.TrimSpace(input.ObservedIssue) == "" {
-		questions = append(questions, "Please confirm the specific issue, error message, and expected outcome.")
-	}
 	if containsSignal(signals, "handoff_requested") {
 		questions = append(questions, "Please confirm whether the user explicitly requested human support and why the issue needs human handling.")
 	}
@@ -222,3 +212,36 @@ func containsSignal(signals []string, target string) bool {
 	}
 	return false
 }
+
+func buildRecentMessageDigest(messages []models.Message) string {
+	parts := make([]string, 0, len(messages))
+	for i := range messages {
+		content := strings.TrimSpace(messages[i].Content)
+		if content == "" {
+			continue
+		}
+		parts = append(parts, messageSenderLabel(messages[i].SenderType)+"："+limitAnalysisText(content, 60))
+	}
+	return strings.Join(parts, " | ")
+}
+
+func messageSenderLabel(senderType enums.IMSenderType) string {
+	switch senderType {
+	case enums.IMSenderTypeCustomer:
+		return "Customer"
+	case enums.IMSenderTypeAgent:
+		return "Agent"
+	case enums.IMSenderTypeAI:
+		return "AI"
+	default:
+		return "Message"
+	}
+}
+
+func limitAnalysisText(value string, max int) string {
+	runes := []rune(strings.TrimSpace(value))
+	if max <= 0 || len(runes) <= max {
+		return string(runes)
+	}
+	return strings.TrimSpace(string(runes[:max])) + "..."
+}