MAX Bot API has no reaction endpoint (confirmed 404 in production logs),
so drop the dead code path entirely instead of eating a warning every post.
Telegram's setMessageReaction is a real Bot API method (verified against
aiogram 3.21.0, the pinned version) - wire it up as a non-fatal
best-effort call after a successful send, mirroring the same
try/except-and-log pattern MAX already used.
exostring