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

website/static/tool-edc-lite-erp.html

@@ -15,8 +15,8 @@
 <header class="site-header">
   <div class="container header-inner">
     <a class="brand" href="/">
-      <img src="/static/img/logo.svg" alt="Easy Data Collection">
-      <span class="brand-name">Easy Data Collection</span>
+      <img src="/static/img/logo.svg" alt="Easy Design Collection">
+      <span class="brand-name">EDC|江北的渔夫</span>
     </a>
     <nav class="main-nav" id="mainNav">
       <div class="nav-item has-dropdown">
@@ -34,13 +34,11 @@
         <div class="dropdown">
           <a href="/tools/sequence-diagram/">Sequence-Diagram</a>
           <a href="/tools/uni-viewer/">Uni-Viewer</a>
-          <a href="/tools/engineer-craft/">Engineer Craft</a>
-          <a href="/tools/five-phases-observer/">The Five Phases Observer</a>
-          <a href="/tools/unitouch/">UniTouch Interface</a>
+          <a href="/tools/serial-terminal/">Serial Terminal</a>
+          <a href="/tools/enthalpy-diagram/">Enthalpy Diagram</a>
           <a class="active" href="/tools/edc-lite-erp/">EDC Lite ERP</a>
         </div>
       </div>
-      <a class="nav-link" href="/resources/">资源中心</a>
       <div class="nav-item has-dropdown">
         <a class="nav-link" href="/license/">License</a>
         <button class="nav-caret" type="button" aria-label="展开 License">▾</button>
@@ -125,11 +123,11 @@
   <div class="container footer-inner">
     <div class="footer-brand">
       <img src="/static/img/logo.svg" alt="">
-      <span>Easy Data Collection</span>
+      <span>Easy Design Collection</span>
     </div>
-    <span>Copyright &copy; 2026 Easy Data Collection. All rights reserved.</span>
+    <span>Copyright &copy; 2026 Easy Design Collection. All rights reserved.</span>
     <span class="footer-links">
-      <a href="/resources/">资源中心</a><span class="sep">·</span>
+      <a href="/resources/">内部研究</a><span class="sep">·</span>
       <a href="/license/">License</a><span class="sep">·</span>
       <a href="/admin">管理页面</a><span class="sep">·</span>
       <a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener">苏ICP备2026056863号</a>