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/pages/PublicCourses/index.css

@@ -1,9 +1,12 @@
 .public-courses-page {
   width: 100%;
   height: 100%;
-  box-sizing: border-box;
   padding: 20px;
-  position: relative;
-  display: flex;
-  justify-content: space-between;
+}
+
+.public-courses-content {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  gap: 20px;
 }

src/pages/PublicCourses/index.jsx

@@ -1,13 +1,26 @@
+import { useState } from "react";
 import CoursesVideoPlayer from "@/components/CoursesVideoPlayer";
-import LiveSummary from "@/components/LiveSummary";
+import PublicCourseList from "@/components/PublicCourseList";
 import { mockData } from "@/data/mockData";
 import "./index.css";
 
 const PublicCourses = () => {
+  const [selectedCourse, setSelectedCourse] = useState(null);
+
+  const handleCourseClick = (course) => {
+    setSelectedCourse(course);
+  };
+
   return (
     <div className="public-courses-page">
-      <CoursesVideoPlayer teacherData={mockData.teacherData} />
-      <LiveSummary />
+      <div className="public-courses-content">
+        <CoursesVideoPlayer 
+          selectedCourse={selectedCourse} 
+          teacherData={mockData.teacherData} 
+          unitPosters={mockData.unitPosters}
+        />
+        <PublicCourseList onCourseClick={handleCourseClick} />
+      </div>
     </div>
   );
 };