Implement conversation snapshot structure

whatsapp-router/src/types.ts

@@ -193,10 +193,35 @@ export interface WhatsAppMessage {
   text: string;
 }
 
+export interface Participant {
+  id: string;
+  name: string;
+  isMe: boolean;
+  isAdmin?: boolean;
+}
+
+export interface Msg {
+  id: string;
+  from: string;
+  to: string;
+  ts: number;
+  type: 'chat' | 'image' | 'audio' | 'sticker' | 'doc';
+  text?: string;
+  mediaUrl?: string;
+  mentions?: string[];
+  meta: {
+    ack: number;
+    hasReaction: boolean;
+    isQuoted: boolean;
+  };
+}
+
 export interface Conversation {
   chatId: string;
-  messages: WhatsAppMessage[];
+  title: string;
+  isGroup: boolean;
+  unreadCount: number;
+  participants: Participant[];
+  messages: Msg[];
   createdAt: number;
-  updatedAt: number;
-  messageCount: number;
 }