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feat(unity): add maimai DX animated themes - #23
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Import the 25 navichara models from the maimai DX AssetBundles (23 shipped: 07 is absent from the bundle, 17 and 23 are static partner characters) as browser-playable themes. A build-time extractor turns the prefab hierarchy, RectTransform poses and animation curves into model.json plus lossless WebP layers; the server embeds them under assets/unity and serves whitelisted manifest and sprite routes (manifests no-store, sprites immutable); and unity-player.html plays the idle motion with the counter overlay without a Unity runtime. The playground gains an "unity" kind with its filter entry, iframe preview and iframe embed snippet, and the gallery thumbnails are captured from the real player at a fixed frame instead of a single sprite. 构建期把舞萌DX 的 UGUI 导航角色转换成浏览器模型（model.json + 无损 WebP 分层图）， 服务端内嵌 assets/unity 并提供白名单接口（manifest no-store、分层图 immutable）， 轻量播放器页面播放待机动作并叠加计数；Playground 增加 unity 类型（筛选、iframe 预览与嵌入代码），图库缩略图由真实播放器固定帧生成，共 23 个主题。
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摘要
新增舞萌DX（maimai DX）Unity UGUI 动态立绘主题 23 个：
maimai-navichara-01…-26（原包缺 07；17、23 是静态联动角色，不单独出主题）。实现
scripts/extract-unity-ui.py用 UnityPy 解析 AssetBundle 的 prefab 层级、RectTransform 姿态、Sprite 与 AnimationClip，导出assets/unity/<name>/model.json+ 无损透明 WebP 分层图；scripts/verify-unity-ui.py回读校验坐标、图层与换图曲线。embed.FS打包，新增GET /api/unity/models与GET /unity/models/:name/:file（严格白名单；model.jsonno-store，分层图immutable+ CORS）。web/public/unity-player.html用 DOM/CSS + rAF 复现 UGUI 变换，随机/点击切换待机动作、contain-fit、{n}计数 overlay，支持prefers-reduced-motion首帧降级与截图用的thumbnail=1&time=0固定帧模式。kind:"unity"进入/api/themes；Playground 增加 Unity 筛选、iframe 预览，并把非 PSB 主题的嵌入代码改成对应 player 的 iframe；主题元数据补充舞萌DX游戏分类与 23 个角色。scripts/capture-unity-thumbnails.py用真实播放器按固定待机帧截图 23 张 256×256 透明 WebP（不再取“最大单张贴图”），--check校验漂移。测试
go vet ./...、go test -count=1 -p 1 ./...全绿（本地；-race由 CI 在 Ubuntu 跑）pnpm generate通过/api/themes返回 23 个kind:"unity"；图库 Unity 筛选项 23 张卡片、0 张加载失败、缩略图 256×256；预览 iframe 正常渲染并计数python scripts/capture-unity-thumbnails.py --check→OK: 23 Unity thumbnails match the rendered models/unity-player.html?model=maimai-navichara-20&name=preview正常显示计数；17/23 号确认不出主题说明
capture-unity-thumbnails.py，--check会报出漂移。