feat: add -R/--random flag for anime discovery mode (#1601)

[RayanVSS]

[# Pull Request Template

Type of change

• Bug fix
• Feature
• Documentation update

Description

Adds a -R / --random flag for anime discovery mode (closes #1601).

When you don't know what to watch, ani-cli -R fetches a random page of popular anime from AllAnime and presents them in the fzf/rofi selection menu. Once you pick one, the normal episode selection flow takes over.

Checklist

• any anime playing
• bumped version

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• next, prev and replay work
• -c history and continue work
• -d downloads work
• -s syncplay works
• -q quality works
• -v vlc works
• -e (select episode) aka -r (range selection) works
• -S select index works
• --skip ani-skip works
• --skip-title ani-skip title argument works
• --no-detach no detach works
• --exit-after-play auto exit after playing works
• --nextep-countdown countdown to next ep works
• --dub and regular (sub) mode both work
• all providers return links (not necessarily on a single anime, use debug mode to confirm)

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

[Derisis13]

Didn't we used to have something like this, which was scrapped due to not being used?

[port19x]

No