chore: add VitePress source for website

Author: qz-qian

site-src/.gitignore

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+node_modules
+docs/.vitepress/dist
+docs/.vitepress/cache
+docs/.vitepress/.temp

site-src/README.md

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+# MathClaw ????
+
+?????? `MathClaw.github.io` ????? VitePress ???
+
+## ????
+
+```bash
+cd site-src
+npm install
+npm run docs:dev
+```
+
+## ??
+
+```bash
+cd site-src
+npm run docs:build
+```
+
+?????? `docs/.vitepress/dist/`?
+??????????? HTML / assets ?? GitHub Pages ???
+????????????????????????????

site-src/docs/.vitepress/config.mts

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+import { defineConfig } from "vitepress";
+
+export default defineConfig({
+  title: "MathClaw",
+  description: "AI 驱动的数学学习工作台",
+  base: "/MathClaw.github.io/",
+  lang: "zh-CN",
+  srcDir: ".",
+  cleanUrls: false,
+  lastUpdated: false,
+  appearance: true,
+  themeConfig: {
+    logo: "/logo.png",
+    search: {
+      provider: "local",
+      options: {
+        locales: {
+          root: {
+            translations: {
+              button: {
+                buttonText: "搜索",
+                buttonAriaLabel: "搜索"
+              },
+              modal: {
+                displayDetails: "显示详细列表",
+                resetButtonTitle: "重置搜索",
+                backButtonTitle: "关闭搜索",
+                noResultsText: "没有找到结果",
+                footer: {
+                  selectText: "选择",
+                  selectKeyAriaLabel: "回车",
+                  navigateText: "切换",
+                  navigateUpKeyAriaLabel: "上箭头",
+                  navigateDownKeyAriaLabel: "下箭头",
+                  closeText: "关闭",
+                  closeKeyAriaLabel: "Esc"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    socialLinks: [{ icon: "github", link: "https://github.com/MathClaw-ruc/MathClaw" }],
+    nav: [
+      { text: "首页", link: "/" },
+      { text: "指南", link: "/guide/pre-config" },
+      { text: "产品展示", link: "/product" },
+      { text: "参与贡献", link: "/contribution" },
+      { text: "GitHub", link: "https://github.com/MathClaw-ruc/MathClaw" }
+    ],
+    sidebar: {
+      "/guide/": [
+        {
+          text: "快速开始",
+          items: [
+            { text: "预配置", link: "/guide/pre-config" },
+            { text: "工作区与记忆", link: "/guide/data-preparation" },
+            { text: "本地安装", link: "/guide/local-start" },
+            { text: "通道部署", link: "/guide/docker-start" }
+          ]
+        },
+        {
+          text: "资源",
+          items: [{ text: "常见问题", link: "/guide/troubleshooting" }]
+        }
+      ]
+    },
+    footer: {
+      message: "基于 MIT License 发布。",
+      copyright: "(c) 2026 MathClaw"
+    },
+    editLink: {
+      pattern: "https://github.com/MathClaw-ruc/MathClaw/edit/main/docs/:path",
+      text: "在 GitHub 上编辑此页"
+    },
+    outline: {
+      label: "本页目录"
+    },
+    docFooter: {
+      prev: "上一页",
+      next: "下一页"
+    },
+    lastUpdated: {
+      text: "最后更新于"
+    },
+    sidebarMenuLabel: "菜单",
+    returnToTopLabel: "返回顶部",
+    darkModeSwitchLabel: "外观",
+    langMenuLabel: "语言"
+  }
+});