ChannelBriefDto

{
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "senler_channel_id": 123456789,
    "name": "My Channel",
    "type": "vk",
    "external_id": "@mychannel",
    "avatar_url": "string",
    "is_paused": false,
    "bot_username": "my_bot",
    "migration": {
        "process_id": "string",
        "role": "source",
        "status": "pending",
        "progress": {
            "total": 5000,
            "processed": 1200,
            "percentage": 24
        },
        "target_project_name": "Проект Б"
    }
}