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* fix(telegram): deny all users when allowed_users has no valid ID
TelegramChannel parsed channels.telegram.allowed_users with int() and
dropped every entry that failed without logging, and _check_user treated
an empty result as "no allowlist". A list of @usernames therefore opened
the bot to everyone. A single string ID was iterated character by
character ("123456" allowed users 1-6 and blocked 123456), which is what
an allowed_users: $ENV reference resolves to, and null or a bare integer
crashed the channel at startup.
The allowlist is now parsed into frozenset[int] | None: None (unset,
null, empty list, blank string) still allows everyone, a single ID is a
one-entry list, entries that are not positive numeric IDs (@usernames,
floats, booleans, comma-joined strings) are dropped with a warning, and
a configured list with no valid ID denies every user and logs an error.
* docs(changelog): reference #6230 for the telegram allowed_users fix
* fix(telegram): say "positive" in the allowed_users drop warning
0 and negative integers are numeric but still dropped, so "expected one
numeric Telegram user ID" misdescribed them. The warning now asks for a
positive numeric ID, matching _parse_telegram_user_id, and the drop test
covers 0 and -5 alongside @alice.
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>