chat_id is shared by every member of a group chat, so all group
messages incremented one shared row and username kept getting
overwritten by whoever sent last. Track link counts in a new
user_links table keyed by the real from_user.id instead.
Per-line strip() only stripped the first line's leading spaces, leaving
subsequent lines indented differently. RTL names (Arabic etc.) also
flipped the number/counter to the right via Telegram's bidi handling.
Adds users.link_count, incremented in bot.py whenever a user submits
a recognized link (regardless of eventual download success), and
surfaces it in admin_bot's /stat as a count of users who ever sent a
link plus a top-5 leaderboard by link count.
Admin sends /send_messages, the next text message is broadcast to
every user in the users table. Sends via TELEGRAM_BOT_TOKEN (the
client bot), not the admin bot's own token — broadcasting through
context.bot would land in the user's chat with the admin bot, which
they've never opened, instead of the client bot they actually use.
- Замена reply_video() на reply_document() в bot.py — Telegram больше не сжимает видео
- Исправление format_id в get_youtube_formats(): конкретные format codes + fallback best[height<=N]
- Замена bestvideo[height<=N]+bestaudio на best[height<=N] — гарантированно работает когда
YouTube не отдаёт отдельные video-only потоки для низких разрешений
- Добавлено логирование реально скачанного формата для диагностики
