Configure remote database connection and update documentation

backend/dist/modules/conversations/entities/conversation.entity.d.ts

@@ -0,0 +1,12 @@
+import { User } from '../../users/entities/user.entity';
+import { Message } from '../../messages/entities/message.entity';
+export declare class Conversation {
+    id: string;
+    name?: string;
+    isGroup: boolean;
+    participants: User[];
+    messages: Message[];
+    lastMessage?: Message;
+    createdAt: Date;
+    updatedAt: Date;
+}