feat: 首页改版为研究优先的博客风；新增 Serial Terminal / Enthalpy Diagram；下架三个工具；品牌与结构更新
- 首页：主力项目 Sequence-Diagram 大图展示 + 前沿研究三卡 + 工具矩阵（去彩色渐变块） - 新增工具页：串口调试助手（Android）与湿空气焓湿图（Android），含实机截图 - 下架 Engineer Craft / Five Phases / UniTouch（保留页面与路由） - 全站品牌 Easy Data Collection → Easy Design Collection（EDC 总品牌） - 资源中心更名「内部研究」，仅保留 footer 入口 - 导航下拉更新；产品线统计更新为 6
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