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docs: 补齐 variants 元素契约与 CHANGELOG 近三批 resolve 变更 - #29
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data.variants元素契约：五键（url/bitrate/width/height/quality）各自的类型与 null 语义、排序规则（码率升序、同码率按短边、无效码率排末尾）、variants[0]即最低码率档（ASR 取首条最省流量）、仅含 mp4 不含 HLS。download_mode=audio（PR feat: resolve 支持 download_mode=audio（原生音频轨 / Cobalt 透传 / 显式 400） #25）、quality清晰度封顶（PR feat: resolve 支持 quality 清晰度封顶（≤cap 取最高档，显式覆盖平台默认） #26）、Xdata.variants（PR feat: X(Twitter) resolve 透出全部 mp4 variants（码率升序），供下游 ASR 自选低码率流 #28）。逐项对照实现核对：元素 null 口径见
app/services/platforms/twitter.py:52-66与app/api/resolve.py:84-91；排序见twitter.py:56-62。纯文档 PR，生产无需重新部署。