Closes#64. Bilibili moved the unsigned /x/web-interface/search/type endpoint
behind their anti-bot wall; it now returns an HTML error page (出错啦!) even
with buvid3+buvid4 cookies, causing `play -b` to report "No results found".
Switch search() to /x/web-interface/wbi/search/type with proper wbi signing:
fetch img_key/sub_key from /nav, derive the mixin key via the standard
permutation, and sign each request with wts + w_rid (md5). Keys are cached
for 6h since they rotate ~daily. Other endpoints (view, playurl, popular,
top/rcmd) still work unsigned and are left unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Implement BiliBiliProvider for video-as-audio playback using direct
BiliBili API calls (search, video info, DASH audio URL extraction).
Add QR code login support and cookie persistence. Update FFmpeg to
send Referer header for BiliBili CDN URLs. Extend platform union type
to "netease" | "qq" | "bilibili" across all interfaces. Add -b flag
for chat commands and B站 badge in web UI.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
