feat: support first available episode in ranges

[port19x]

Pull Request Template

Type of change

• Bug fix
• Feature
• Documentation update

Description

Arguably both a bug fix at the provider level and a new feature.
This fixes #1853

Checklist

• any anime playing
• bumped version

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• next, prev, replay and select work
• -c history and continue work
• -d downloads work
• -e (select episode) aka -r (range selection) works
• -S select index works
• -q quality works
• -s syncplay works
• -v vlc works
• --dub and regular (sub) mode both work
• --nextep-countdown countdown to next ep works

---

• -h help info is up to date
• Readme is up to date
• Man page is up to date

Additional Testcases

(these don't block a merge)

• --skip ani-skip works
• --no-detach no detach works
• --exit-after-play auto exit after playing works