fix: 规范化含 BV 号的任意 B 站链接（稍后再看/收藏夹/追踪参数）#421
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从"稍后再看"（/list/watchlater/?bvid=BV...）、收藏夹播放页等场景 复制的链接会被判为无效链接，尽管其中包含完整 BV 号；校验通过的 链接也会带着追踪参数原样传给 yt-dlp。 在请求入口新增 normalize_video_url()：提取 BV 号重建标准 /video/BVxxx 链接，保留分 P 参数（?p=N），丢弃其余查询参数。 b23.tv 短链与其他平台行为不变，无 BV 号链接仍按原逻辑拒绝。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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问题
从 B 站"稍后再看"（
bilibili.com/list/watchlater/?bvid=BV...）、收藏夹播放页（/list/mlXXX?bvid=BV...）等场景复制的链接会被提示"暂不支持该视频平台或链接格式无效"，尽管链接中包含完整的 BV 号。校验器只匹配/video/BVxxx路径格式；且校验通过的链接会带着spm_id_from、vd_source等追踪参数原样传给 yt-dlp。修复
在请求入口新增
normalize_video_url()（app/utils/url_parser.py）：https://www.bilibili.com/video/BVxxx链接?p=N，复用已有的extract_bilibili_p_number()），丢弃追踪参数b23.tv短链原样返回（保持现有下游解析逻辑，校验器内不发起网络请求）note.py与video_url_validator.py的VideoRequest均通过model_validator(mode="before")在校验前规范化（仅platform == "bilibili"时生效，YouTube/抖音/快手不受影响）。测试
新增
backend/tests/test_url_normalize.py，10 个用例覆盖：稍后再看、收藏夹播放页、追踪参数清理、分 P 保留、无 BV 号拒绝、b23.tv 与 YouTube 不受影响。已在 Docker 镜像环境全部通过，并用真实稍后再看链接端到端验证笔记生成成功。🤖 Generated with Claude Code