公共课直播间页面改造：将直播纪要替换为课程列表

功能更新：
- 创建了PublicCourseList组件，与课程直播间保持一致的课程列表样式
- 实现了公共课程数据结构，包含三个单元：AI课、企业高管公开课、营销能力课
- 添加了generatePublicCourseLiveList函数，自动将课程分类到对应单元
- 基于关键词智能分类课程（AI/AIGC、企业/管理、营销/运营等）
- 垂直方向课程保留在原未分类单元中，不显示在公共课列表

UI优化：
- 课程列表支持折叠展开，显示单元完成进度
- 时间轴样式显示课程进度状态
- 支持课程选择联动视频播放器
- 响应式布局，与课程直播间保持一致的交互体验

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

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

src/components/PublicCourseList/index.css

@@ -0,0 +1,167 @@
+.public-course-list {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  background: #fff;
+  border-radius: 8px;
+  overflow: hidden;
+}
+
+.course-list-header {
+  padding: 16px 20px;
+  border-bottom: 1px solid #e5e6eb;
+  background: #fafafa;
+}
+
+.course-list-header h3 {
+  margin: 0;
+  font-size: 16px;
+  font-weight: 500;
+  color: #1d2129;
+}
+
+.course-list-collapse {
+  flex: 1;
+  overflow-y: auto;
+  padding: 12px;
+}
+
+.course-list-collapse .arco-collapse-item {
+  margin-bottom: 8px;
+  border: 1px solid #e5e6eb;
+  border-radius: 4px;
+  overflow: hidden;
+}
+
+.course-list-collapse .arco-collapse-item-header {
+  background: #f7f8fa;
+  padding: 12px 16px;
+}
+
+.unit-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  width: 100%;
+}
+
+.unit-name {
+  font-size: 14px;
+  font-weight: 500;
+  color: #1d2129;
+}
+
+.unit-course-count {
+  font-size: 12px;
+  color: #86909c;
+  margin-right: 20px;
+}
+
+.course-timeline {
+  padding: 16px 0;
+}
+
+.timeline-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: #e5e6eb;
+}
+
+.timeline-dot.completed {
+  background: #00b42a;
+}
+
+.timeline-dot.current {
+  background: #ff7d00;
+  box-shadow: 0 0 0 4px rgba(255, 125, 0, 0.2);
+}
+
+.timeline-dot.upcoming {
+  background: #165dff;
+}
+
+.course-item {
+  padding: 12px;
+  background: #f7f8fa;
+  border-radius: 4px;
+  cursor: pointer;
+  transition: all 0.3s;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.course-item:hover {
+  background: #e8f3ff;
+  transform: translateX(4px);
+}
+
+.course-item.selected {
+  background: #e8f3ff;
+  border-left: 3px solid #165dff;
+}
+
+.course-item.completed {
+  opacity: 0.7;
+}
+
+.course-info {
+  flex: 1;
+}
+
+.course-name {
+  font-size: 14px;
+  font-weight: 500;
+  color: #1d2129;
+  margin-bottom: 4px;
+}
+
+.course-meta {
+  display: flex;
+  gap: 16px;
+  font-size: 12px;
+  color: #86909c;
+}
+
+.course-status {
+  padding: 2px 8px;
+  border-radius: 12px;
+  font-size: 12px;
+  white-space: nowrap;
+}
+
+.course-status.completed {
+  background: #e8ffea;
+  color: #00b42a;
+}
+
+.course-status.current {
+  background: #fff7e8;
+  color: #ff7d00;
+}
+
+.course-status.upcoming {
+  background: #e8f3ff;
+  color: #165dff;
+}
+
+/* 自定义滚动条 */
+.course-list-collapse::-webkit-scrollbar {
+  width: 6px;
+}
+
+.course-list-collapse::-webkit-scrollbar-track {
+  background: #f2f3f5;
+  border-radius: 3px;
+}
+
+.course-list-collapse::-webkit-scrollbar-thumb {
+  background: #c9cdd4;
+  border-radius: 3px;
+}
+
+.course-list-collapse::-webkit-scrollbar-thumb:hover {
+  background: #86909c;
+}