refactor(web): 营销站重构为 Eleventy SSG，内容迁移至 Markdown

- 引入 Eleventy 静态站点生成器，页面统一使用 Nunjucks 模板
- base.njk 提供公共 nav / footer / CSS，消除三个页面间的重复代码
- 抽取 color.css（设计 token）+ style.css（公共组件 + utility 类）
- index.njk：首页迁移，用 utility class 替换大量页面私有 CSS
- download.njk：下载页重构，版本号/更新日志从 CHANGELOG.md 构建时解析，OS 自动识别
- docs.njk：文档页重构，12 章内容从 web/content/docs.md 构建时渲染，三列布局保留
- docs.css 单独提取，docs 专有样式不污染公共 CSS
- 内容面向非技术用户重写，去除技术术语和内部路径引用

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/_data/changelog.js

@@ -0,0 +1,44 @@
+const fs = require('fs');
+const path = require('path');
+
+module.exports = function() {
+  const raw = fs.readFileSync(path.join(__dirname, '../../CHANGELOG.md'), 'utf8');
+  const lines = raw.split('\n');
+  const versions = [];
+  let current = null;
+  let currentSection = null;
+
+  for (const line of lines) {
+    const versionMatch = line.match(/^## \[([^\]]+)\] - (\d{4}-\d{2}-\d{2})/);
+    if (versionMatch) {
+      if (current) versions.push(current);
+      if (versions.length >= 3) break;
+      current = { version: versionMatch[1], date: versionMatch[2], sections: [], intro: '' };
+      currentSection = null;
+      continue;
+    }
+
+    const sectionMatch = line.match(/^### (.+)/);
+    if (sectionMatch && current) {
+      currentSection = { type: sectionMatch[1], items: [] };
+      current.sections.push(currentSection);
+      continue;
+    }
+
+    const itemMatch = line.match(/^- (.+)/);
+    if (itemMatch && current) {
+      if (currentSection) {
+        currentSection.items.push(itemMatch[1]);
+      }
+      continue;
+    }
+
+    // Free-form text before first section (e.g. v1.0.0 intro paragraph)
+    if (line.trim() && current && !currentSection && !line.startsWith('#')) {
+      current.intro = current.intro ? current.intro + ' ' + line.trim() : line.trim();
+    }
+  }
+  if (current && versions.length < 3) versions.push(current);
+
+  return versions;
+};

web/_data/docs.js

@@ -0,0 +1,51 @@
+const fs = require('fs');
+const path = require('path');
+const md = require('markdown-it')({ html: false, breaks: false, linkify: false });
+
+const TOC_GROUPS = [
+  { group: '快速开始', nums: [1, 2, 3] },
+  { group: '业务操作', nums: [4, 5, 6, 7, 8, 9] },
+  { group: '基础设置', nums: [10, 11, 12] },
+];
+
+module.exports = function() {
+  const raw = fs.readFileSync(path.join(__dirname, '../content/docs.md'), 'utf8');
+  const lines = raw.split('\n');
+
+  // Split into chapters by "## {n}. {title}" headings
+  const chapters = [];
+  let current = null;
+
+  for (const line of lines) {
+    const match = line.match(/^## (\d+)\. (.+)/);
+    if (match) {
+      if (current) chapters.push(current);
+      const num = parseInt(match[1], 10);
+      current = { num, id: 'ch-' + num, title: match[2].trim(), bodyLines: [] };
+    } else if (current) {
+      current.bodyLines.push(line);
+    }
+  }
+  if (current) chapters.push(current);
+
+  // Render each chapter's body to HTML
+  const rendered = chapters.map(ch => ({
+    num: ch.num,
+    id: ch.id,
+    title: ch.title,
+    html: md.render(ch.bodyLines.join('\n')),
+  }));
+
+  // Build TOC
+  const chapterMap = {};
+  rendered.forEach(ch => { chapterMap[ch.num] = ch; });
+
+  const toc = TOC_GROUPS.map(g => ({
+    group: g.group,
+    items: g.nums
+      .filter(n => chapterMap[n])
+      .map(n => ({ id: chapterMap[n].id, num: n, title: chapterMap[n].title })),
+  }));
+
+  return { toc, chapters: rendered };
+};

web/_data/site.json

@@ -0,0 +1,12 @@
+{
+  "name": "岩美酒库管理系统",
+  "tagline": "为酒行与酒店设计的库存管理平台",
+  "copyright": "© 2026 岩美科技 · 保留所有权利",
+  "icp": "沪 ICP 备 2026000000 号 · 沪公网安备 31010000000000 号",
+  "support": {
+    "email": "support@yanmei.app",
+    "phone": "400-880-8888"
+  },
+  "appUrl": "/app/",
+  "lucideVersion": "0.469.0"
+}

web/_data/sysreq.js

@@ -0,0 +1,8 @@
+const fs = require('fs');
+const path = require('path');
+const md = require('markdown-it')({ html: false, breaks: false });
+
+module.exports = function() {
+  const content = fs.readFileSync(path.join(__dirname, '../content/system-requirements.md'), 'utf8');
+  return md.render(content);
+};