refactor: split backend into standalone server project

Remove embedded frontend and workflow editor assets, add standalone API deployment configuration, and retain the current backend service updates.

internal/services/conversation_human_dispatch_service.go

@@ -116,6 +116,16 @@ func (s *conversationHumanDispatchService) ApplyHumanOnlyCreate(conversationID i
 	return s.dispatchAfterHandoff(conversationID, aiAgent.ID, activeTeamIDs, "仅人工模式新会话", false)
 }
 
+func (s *conversationHumanDispatchService) ApplyHumanChannelCreate(conversationID int64) (*HandoffDecisionResult, error) {
+	if err := s.moveToGlobalPool(conversationID, "人工客服渠道"); err != nil {
+		return nil, err
+	}
+	if err := s.sendAIText(conversationID, 0, HandoffWaitingMessage); err != nil {
+		return nil, err
+	}
+	return &HandoffDecisionResult{Decision: HandoffDecisionGlobalPool, Message: HandoffWaitingMessage}, nil
+}
+
 func (s *conversationHumanDispatchService) DispatchPendingConversation(conversationID int64, aiAgent models.AIAgent) (*HandoffDecisionResult, error) {
 	conversation := ConversationService.Get(conversationID)
 	if conversation == nil {