fix(scraper): extract real artist slugs and parse current uploader markup

[ghostcoder42]

Tapping an artist on the video page led to a model list without the current video — usually a 404 rendered as an error screen. Two defects:

1. The artist regex targeted the old markup (class="item btn_link" with the name span directly inside). The site now renders vote-chip pills (class="item btn_link video_meta_pill" with a wrap_image div before the span), so artist extraction never matched and the chip disappeared entirely.
2. Navigation derived the model slug from the display name (toLowerCase + dashes), which 404s for names like "OpenNSFW (VA)" whose real site slug is "opennsfw".

parseVideoDetail now collects every model pill into an artists[] (name + slug taken from the site's own href), which the post page renders as one chip per artist. The sidebar's "Top Artists" links (class="item", no btn_link) are excluded, and each name is bound to its own anchor so adjacent pills can't bleed into each other. The uploader regex is tightened the same way (name bound to the member anchor, avatar alt first, plain text fallback for avatar-less members) instead of lazily scanning for the next alt attribute in the whole document.

Artist chips promote a known role suffix from the model's display name to the label prefix — "OpenNSFW (VA)" renders as "VA: OpenNSFW", "HentAudio (Audio)" as "Audio: HentAudio"; plain names keep the "Artist: Name" prefix. Unknown parentheticals stay part of the name.

[github-actions]

💯 Test Coverage

Lines	Statements	Branches	Functions
	52.1% (818/1570)	44.01% (408/927)	42.77% (216/505)

😎 Tests Results

Tests	Skipped	Failures	Errors	Time
264	0 💤	0 ❌	0 🔥	14.123s ⏱️

👀 Tests Details • (52%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	52.1	44.01	42.77	52.57
src/app/post	89.15	76.53	80	91.17
[id].tsx	89.15	76.53	80	91.17	195, 268, 278, 317–396
src/lib/r34	83.53	76.61	72.72	84.31
artists.ts	100	100	100	100
offline-detail.ts	100	100	100	100
scraper.ts	81.65	72	70	83.16	9–38, 114–117
types.ts	0	0	0	0