List Telegram channels the account is subscribed to.

Args: account: Account name (default: configured default account). search: Optional RegExp pattern to filter by channel title or username (max 200 chars). limit: Maximum channels to return (default 100, max 500).

Returns JSON: {"count": N, "channels": [{"id", "title", "username", "type", "participants_count"}]}

Read messages from a Telegram channel.

Args: channel: Channel @username or numeric ID. account: Account name (default: configured default account). limit: Max messages when offset_date is None (default 20, max 1000). offset_date: ISO 8601 datetime — read all messages before this date (capped at 1000). search: Optional RegExp pattern to filter message text (max 200 chars).

Returns JSON: {"count": N, "channel": {"id", "title", "username"}, "messages": [{"id", "date", "text", "views", "reactions", "media_type", "link"}]}