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/pkg/enums/im.go

@@ -240,20 +240,21 @@ func GetAIAgentFallbackModeLabel(mode AIAgentFallbackMode) string {
 }
 
 const (
-	IMRealtimeEventConnected               = "connected"
-	IMRealtimeEventPong                    = "pong"
-	IMRealtimeEventSubscribed              = "subscribed"
-	IMRealtimeEventUnsubscribed            = "unsubscribed"
-	IMRealtimeEventResyncRequired          = "resyncRequired"
-	IMRealtimeEventMessageCreated          = "message.created"
-	IMRealtimeEventMessageRecalled         = "message.recalled"
-	IMRealtimeEventConversationCreated     = "conversation.created"
-	IMRealtimeEventConversationUpdated     = "conversation.updated"
-	IMRealtimeEventConversationAssigned    = "conversation.assigned"
-	IMRealtimeEventConversationTransferred = "conversation.transferred"
-	IMRealtimeEventConversationClosed      = "conversation.closed"
-	IMRealtimeEventConversationRead        = "conversation.read"
-	IMRealtimeEventNotificationCreated     = "notification.created"
+	IMRealtimeEventConnected                = "connected"
+	IMRealtimeEventPong                     = "pong"
+	IMRealtimeEventSubscribed               = "subscribed"
+	IMRealtimeEventUnsubscribed             = "unsubscribed"
+	IMRealtimeEventResyncRequired           = "resyncRequired"
+	IMRealtimeEventMessageCreated           = "message.created"
+	IMRealtimeEventMessageRecalled          = "message.recalled"
+	IMRealtimeEventConversationCreated      = "conversation.created"
+	IMRealtimeEventConversationUpdated      = "conversation.updated"
+	IMRealtimeEventConversationAssigned     = "conversation.assigned"
+	IMRealtimeEventConversationTransferred  = "conversation.transferred"
+	IMRealtimeEventConversationClosed       = "conversation.closed"
+	IMRealtimeEventConversationRead         = "conversation.read"
+	IMRealtimeEventConversationQueueUpdated = "conversation.queue_updated"
+	IMRealtimeEventNotificationCreated      = "notification.created"
 )
 
 const (

internal/pkg/enums/knowledge.go

@@ -1,21 +1,5 @@
 package enums
 
-type VectorDBType string
-
-const (
-	VectorDBTypeQdrant  VectorDBType = "qdrant"
-	VectorDBTypeLanceDB VectorDBType = "lancedb"
-)
-
-var vectorDBTypeLabelMap = map[VectorDBType]string{
-	VectorDBTypeQdrant:  "Qdrant",
-	VectorDBTypeLanceDB: "LanceDB",
-}
-
-func GetVectorDBTypeLabel(dbType VectorDBType) string {
-	return vectorDBTypeLabelMap[dbType]
-}
-
 type KnowledgeDocumentContentType string
 
 const (

internal/pkg/enums/knowledge_test.go

@@ -1,12 +0,0 @@
-package enums
-
-import "testing"
-
-func TestVectorDBTypeLabelIncludesLanceDB(t *testing.T) {
-	if VectorDBTypeLanceDB != "lancedb" {
-		t.Fatalf("VectorDBTypeLanceDB = %q, want %q", VectorDBTypeLanceDB, "lancedb")
-	}
-	if got := GetVectorDBTypeLabel(VectorDBTypeLanceDB); got != "LanceDB" {
-		t.Fatalf("GetVectorDBTypeLabel(VectorDBTypeLanceDB) = %q, want %q", got, "LanceDB")
-	}
-}

internal/pkg/enums/ticket.go

@@ -1,55 +0,0 @@
-package enums
-
-type TicketStatus string
-
-const (
-	TicketStatusPending    TicketStatus = "pending"
-	TicketStatusInProgress TicketStatus = "in_progress"
-	TicketStatusDone       TicketStatus = "done"
-)
-
-var TicketStatusValues = []TicketStatus{
-	TicketStatusPending,
-	TicketStatusInProgress,
-	TicketStatusDone,
-}
-
-var ticketStatusLabelMap = map[TicketStatus]string{
-	TicketStatusPending:    "待处理",
-	TicketStatusInProgress: "处理中",
-	TicketStatusDone:       "已处理",
-}
-
-func GetTicketStatusLabel(status TicketStatus) string {
-	return ticketStatusLabelMap[status]
-}
-
-func IsValidTicketStatus(status string) bool {
-	for _, item := range TicketStatusValues {
-		if string(item) == status {
-			return true
-		}
-	}
-	return false
-}
-
-type TicketSource string
-
-const (
-	TicketSourceManual       TicketSource = "manual"
-	TicketSourceConversation TicketSource = "conversation"
-)
-
-var TicketSourceValues = []TicketSource{
-	TicketSourceManual,
-	TicketSourceConversation,
-}
-
-func IsValidTicketSource(source string) bool {
-	for _, item := range TicketSourceValues {
-		if string(item) == source {
-			return true
-		}
-	}
-	return false
-}