feat: 顶级官网式沉浸打磨（视差叙事 / 海报 Hero / 星尘氛围） - #4
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① 滚动即叙事：Story 图片纵深视差（--depth 每帧写入，60fps）、sticky 右上角号牌跟随屏次与展厅、坐标统一防边界误判 ② Hero 海报化：主标题超大号 clamp 最高 10.5rem、入场模糊浮现动画、视频背景增强暗化 ③ 微交互：按钮按压反馈/焦点环、既有导航下划线/卡片微缩放/标签 hover 保留 ④ 深空氛围：story 专属星尘粒子层（上升星点+柔光团，零依赖 canvas，尊重减弱动效与专注模式） - 移动端 390 视口无溢出；桌面/移动 console 零报错；tsc+build 通过
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向 SpaceX / Apple 等高级官网学习的一轮落地：
① 滚动即叙事：/story 每屏图片加纵深视差（--depth 每帧写入，transform-only 60fps）；右上角新增 sticky 号牌，跟随当前屏号 + 展厅英文名（进横廊显示横廊序号）
② Hero 海报化：主标题超大号（最高 10.5rem）+ 幕布式入场动画；视频背景增强暗化对比
③ 微交互：按钮按压反馈 + 键盘焦点环；导航下划线生长 / 卡片 hover 微缩放沿用
④ 深空氛围：story 专属星尘粒子层（缓慢上升星点 + 柔光团，零依赖 canvas；尊重 prefers-reduced-motion 与专注模式）
浏览器实测：桌面/移动 390 视口均无横向溢出；号牌顶部/横廊/回顶状态正确；--depth 随滚动变化；console 零报错；tsc + build 通过。