Long-term memory fix. No config change (config-version stays 7).

• Fix: a player could not make the bot forget something by just saying so in chat ("forget that", "zapomeň na to", "už o tom nemusíš mluvit"): the note stayed in the database and the bot kept bringing it up. Now such a line (Czech or English) runs the note extraction at once instead of every extract-every-exchanges answers; the model sees that player's stored notes with their ids and the bot's last few messages, names the notes meant, and they are deleted (by id, or by a matching topic when none fits). The request itself is never stored as a note
• Only the player who asks can lose notes: ids are checked against that player's notes, and nobody can talk the bot into deleting another player's notes
• A failed extraction (provider error) now keeps its chat lines for the next round instead of dropping them, so a request to forget is not lost
• The bot is told to simply agree and drop the topic when asked to forget something; its self-description mentions it, too