[Feature] Please add the feature to disable transcoding under Quark TV streaming mode，thank you！

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需求描述

I have Quark Super Member. In openlist, if I select the quark TV streaming mode: copy the video link from openlist to NDM to download video files larger than 80 GB, with a download speed of over 100 MB/s. Smaller video files will be transcoded and compressed, resulting in reduced file size and a download speed of around 20 MB/s. If the download mode is selected, the download speed is only 1 MB/s. When using regular Quark with 302 redirect enabled, the download speed reaches 30 MB/s. For regular Quark without 302 redirect, using web proxy and native proxy also yields a download speed of 30 MB/s. I hope an option can be added under quark TV streaming mode to disable transcoding and compression regardless of video file size, so that the download speed of over 100 MB/s can be maintained. Thank you!

实现思路

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附加信息

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AI生成内容（可选）

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Start by locating OpenList's Quark TV streaming-mode implementation and the decision point for transcoding and compression. Trace how that mode handles different video sizes, then compare the regular download and 302-redirect paths described in the issue. Done means an option can disable transcoding and compression in Quark TV streaming mode, with the behavior covered by the relevant tests.