fix(reddit,bilibili): switch to rdt-cli and add bili-cli support (#235)
Reddit: Exa crawling had chronic CRAWL_LIVECRAWL_TIMEOUT issues. rdt-cli (304 stars, public-clis) works without login — search, read full posts, and comments all verified. Massive improvement. Bilibili: add bili-cli (590 stars) as optional enhanced backend for hot/rank/search/feed. yt-dlp remains for video metadata + subtitles. Also fix UA string (was "agent-reach/1.0", now proper browser UA). 75 tests passing. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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