feat: 实现 LeetCode 141 环形链表算法可视化

- 添加代码面板，支持语法高亮和调试效果（行高亮、变量值显示）
- 添加链表可视化，使用 SVG 绘制节点和快慢指针
- 添加控制面板，支持键盘快捷键（←/→/Space）
- 添加悬浮球，展示微信群二维码
- 配置 GitHub Actions 自动部署到 GitHub Pages
- 添加属性测试和单元测试（38 个测试用例）

Author: CC11001100

.eslintrc.cjs

@@ -0,0 +1,19 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    jest: true
+  },
+  extends: 'eslint:recommended',
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module'
+  },
+  rules: {
+    'no-unused-vars': 'warn',
+    'no-console': 'off',
+    'semi': ['error', 'always'],
+    'quotes': ['error', 'single']
+  },
+  ignorePatterns: ['dist/', 'node_modules/', '*.config.js', '*.config.cjs']
+};

.github/workflows/deploy.yml

@@ -0,0 +1,55 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: 'pages'
+  cancel-in-progress: true
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run linter
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run test -- --passWithNoTests
+
+      - name: Build
+        run: npm run build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './dist'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -0,0 +1,26 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*
+
+# Coverage
+coverage/
+
+# Environment
+.env
+.env.local