DUNGEONS-33: clean shutdown locks and add optional Telegram 2048

Co-authored-by: multica-agent <github@multica.ai>

.env.example

@@ -26,6 +26,9 @@ TRUST_PROXY=false
 TELEGRAM_BOT_TOKEN=
 TELEGRAM_BOT_USERNAME=
 TELEGRAM_ADMIN_IDS=
+# Optional BotFather game short name for THIS bot (not a numeric game ID).
+# Empty disables the game. The native Play button opens the original 2048.
+TELEGRAM_GAME_SHORT_NAME=
 
 # Discord uses a signed HTTP interactions endpoint at /_access/discord.
 DISCORD_BOT_TOKEN=