Bot.shorten_url() method delegates to flaskpaste plugin when loaded.
RSS, YouTube, and pastemoni announcements auto-shorten links.
Includes test_flaskpaste.py (9 cases) and FakeBot updates in 3 test files.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Alert backends now populate structured `extra` field with engagement
metrics (views, stars, votes, etc.) instead of embedding them in titles.
Subscription plugins show richer announcements: Twitch viewer counts,
YouTube views/likes/dates, RSS published dates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Subscribe RSS/Atom feeds to IRC channels with periodic polling,
new-item announcements, deduplication, and persistence across restarts.
Supports conditional HTTP requests (ETag/Last-Modified), automatic
backoff on errors, and per-channel feed limits.
