refactor: 移除通用频道管理(LangBot)模块，IM Bot 改为直接对接；迁移 _call_real_llm 至 im_llm

frontend/src/types/index.ts

@@ -63,24 +63,6 @@ export interface Message {
   used_skills?: string[];
 }
 
-// 频道
-// IM账户绑定频道
-export type IMPlatform = 'feishu' | 'wechat' | 'dingtalk' | 'whatsapp' | 'telegram' | 'slack';
-
-export interface Channel {
-  id: string;
-  userId: string;
-  platform: IMPlatform;
-  name: string;
-  accountName: string;
-  agentId?: string;
-  knowledgeBaseId?: string;
-  status: 'connected' | 'disconnected' | 'pending';
-  lastActive?: string;
-  boundModel: string;
-  features: string[];
-  createdAt: string;
-}
 
 // 知识库
 export interface KnowledgeBase {