feat: 实现 CodePanel 组件的代码行高亮和变量显示功能

- 创建 codeSnippets.ts 数据文件，包含 Java/Python/Go/JavaScript 四种语言的 MinStack 实现代码
- 实现 CodePanel.css 样式文件，包含 VS Code Dark+ 风格的语法高亮主题
- 实现代码行高亮功能，当前执行的代码行显示黄色背景
- 实现变量状态面板，在代码面板底部显示当前步骤的变量值
- 更新 stepGenerator.ts 中的代码行映射，与实际代码行号对应
- 创建完整的 App.tsx 集成所有组件
- 修复类型导入问题（使用 type-only imports）

Requirements: 5.7, 5.8, 5.9, 5.10

Author: CC11001100

.github/workflows/deploy.yml

@@ -0,0 +1,53 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: ['main']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: 'pages'
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    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: 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'
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -0,0 +1,42 @@
+# Dependencies
+node_modules/
+.pnp
+.pnp.js
+
+# Build outputs
+dist/
+build/
+*.local
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Environment
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Testing
+coverage/
+
+# Cache
+.cache/
+.eslintcache