feat: 初始化多Agent协作系统项目并添加直播回放功能

- 添加导航栏组件及直播回放按钮
- 实现视频播放模态框
- 配置赛博朋克风格主题
- 添加课程首页和课程页面

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -0,0 +1,35 @@
+# Dependencies
+node_modules/
+/.pnp
+.pnp.js
+
+# Testing
+/coverage
+
+# Production
+/build
+/dist
+
+# Misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Temporary files
+*.tmp
+.cache/