fix: 修复手动链接搜索与直连接口未剥离 @偏移 后缀导致请求失败 - #455
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搜索阶段取标题前剥离 @偏移 后缀：此前带 @偏移 的链接直接传入源请求（如 bilibili 返回 404）并产生脏标题，现统一用 stripLinkOffset 取洁净链接后再取标题。 直连接口 getCommentByUrl 此前完全忽略 @偏移，现与 getComment 对齐：解析 @秒数/@%百分比 偏移、用洁净链接取弹幕、取回后应用偏移；百分比偏移按弹幕最大时间缩放，逻辑与 getComment 一致。 将散落各处的 @偏移 解析统一收口到 offset-util.js 的 stripLinkOffset（消除 7 处重复内联正则），getComment / fetchMergedComments / resolveSourceAndRealId / getCommentByUrl 均复用之。 顺带修复：animeko/bahamut 此前用仅匹配 @秒数 的正则，会静默丢弃 @% 百分比偏移，现经 stripLinkOffset 统一解析后予以保留。偏移为 0（如 @0）时不再回写 @0 后缀（原会保留，属无操作偏移，无实际影响）。
合并链接（含 $$$ 分隔的多个子链接）的弹幕在 fetchMergedComments 中已按各子链接来源分别施加偏移，而 getComment 顶层又对整段合并弹幕再次施加单链接偏移，导致所有弹幕时间被叠加偏移一次（首个子链接无偏移标记时其弹幕被整体抬走）。 改为顶层单链接偏移仅在非合并链接时施加，与既有 danmuOffsetRules 守卫（dandan-api.js:2699）一致——合并链接的偏移完全由 fetchMergedComments 按来源处理。单链接偏移行为与直连接口 getCommentByUrl 不受影响。
合并链接（含 $$$ 分隔的多个子链接）此前在 resolveMergedDuration 中对各子链接时长取最大值，导致返回的 videoDuration 为单个视频的时长（如 3266s），而非合并后时间轴的实际长度（约 6463s），前端进度条与时长显示偏短。 改为：合并链接的时长取各子链接按 @偏移 平移后时间轴末端的最大值——即 max(子链接时长 + 应用的偏移)。偏移量直接复用 applyOffset 的语义（绝对与百分比模式下均将时间轴末端平移 offset 秒），确保返回的合并时长与弹幕实际落点完全一致，且不再手算偏移公式。单链接路径保持不变，正常场景行为不受影响。
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搜索阶段 searchAnimeBody 取标题时直接传入带 @偏移 后缀的原始链接，源对带偏移的 URL 请求失败（如 bilibili 返回 404）并产生脏标题；现取标题前剥离 @偏移 后缀。
直连接口 getCommentByUrl 此前未解析 @偏移，现与 getComment 对齐：解析 @秒数/@%百分比 偏移、取弹幕前剥离 @偏移 后缀、取回后应用偏移。
将散落各处的 @偏移 解析统一提取为 offset-util.js 的 stripLinkOffset，消除重复；animeko/bahamut 经此顺带支持 @% 百分比偏移。
https://www.bilibili.com/video/BV16P4y167Wz/ https://www.bilibili.com/video/BV1Nd4y157pE/@3197