Add `proxy` config option to server (IRC), teams, telegram, and mumble
sections. IRC defaults to false (preserving current direct-connect
behavior); all others default to true. The `derp.http` module now
accepts `proxy=True/False` on urlopen, create_connection,
open_connection, and build_opener -- when false, uses stdlib directly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
TelegramBot adapter with getUpdates long-polling, all HTTP through
SOCKS5 proxy. Duck-typed TelegramMessage compatible with IRC Message.
Message splitting at 4096 chars, @botusername suffix stripping,
permission tiers via user IDs. 75 test cases.
