yt-dlp: 添加 cookie 支持和代理绕过功能#90
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Bilibili's CDN frequently blocks proxy/VPN nodes, causing HTTP 412 or SSL errors during download. This adds two features: - Auto-detect cookies.txt in the workspace (or B2T_COOKIE_FILE env var) for authenticated Bilibili access. - Default to bypassing the system proxy for Bilibili requests, since direct connections are typically more reliable. Set B2T_USE_PROXY=1 to re-enable proxy if needed.
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Closes #82
简介
为 yt-dlp 下载器添加两个功能，提升 Bilibili 访问的稳定性：
Cookie 文件自动检测 — 如果工作目录下存在
cookies.txt（或设置了B2T_COOKIE_FILE环境变量），会自动传递给 yt-dlp，用于需要登录才能访问的视频。默认绕过系统代理 — 代理/VPN（如 Clash Verge）的节点经常被 Bilibili CDN 封锁，导致 HTTP 412 或 SSL 错误。直连通常更稳定，因此默认关闭代理。如需使用代理，设置
B2T_USE_PROXY=1即可恢复。问题背景
国内用户在使用 Clash Verge 等代理软件时，经常遇到以下错误而无法下载 Bilibili 视频：
根本原因是 Bilibili 的反爬虫系统会拦截代理节点的请求。由于直连 Bilibili 对大多数用户来说是稳定可用的，默认绕过代理可以避免这个问题。
改动内容
src/b2t/downloaders/ytdlp.py—_build_ydl_opts方法新增 18 行$B2T_COOKIE_FILE>$WORKSPACE/cookies.txtB2T_USE_PROXY=1可恢复使用系统代理