anten-ka 7b53566dad fix(bot): promo auto-delete + neutralize fake install/change stubs ...

Two user-reported bugs:

1. Promo spam: daily promo message from /start and the Promo menu
   button stayed in chat forever. Now they auto-delete after 30s.
   - new helper _delete_message_after()
   - cmd_start schedules deletion of the daily promo
   - cb_menu_promo sends promo as a SEPARATE ephemeral message
     (instead of editing the main menu in place), so the menu stays
     intact and only the promo self-destructs in 30s.

2. CRITICAL: 'install/change template from bot' was a stub that
   silently corrupted /opt/gotelegram/config.json. cb_lite_domain
   and cb_pro_confirm wrote a fake minimal config ({mode,template,
   port,installed_at}) without secret/domain/mask_host, and showed
   '[OK] installed!' — while never invoking install.sh, never
   downloading the template, never touching nginx. Proxy link
   generation then broke because secret was gone.
   User symptom: 'устанавливал другой шаблон через бота и всё
   повисло'.

   Fix: both callbacks now refuse cleanly and route the user to the
   CLI ('gotelegram' command → menu 1 → 1 or 7). Configuration is
   NOT touched. Full non-interactive install/change from the bot is
   left as future work.

Tested live on VPS:
- bot.py syntax OK (ast.parse on VPS)
- gotelegram-bot restarted, active
- corrupted config.json on VPS rebuilt from telemt TOML ground
  truth (mode=lite, secret, port, mask_host=google.com)

2026-04-10 13:00:04 +03:00

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