fix(HomePage): 根据课程价格显示不同的按钮文本

 <!--
  * @Date: 2025-03-20 19:55:21
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-15 20:07:21
+ * @LastEditTime: 2025-09-25 11:54:13
  * @FilePath: /mlaj/src/views/HomePage.vue
  * @Description: 美乐爱觉教育首页组件
  *
@@ -225,7 +225,7 @@
                       :to="`/courses/${course.id}`"
                       class="bg-white/90 text-green-600 px-3 py-1 rounded-full text-xs font-medium"
                     >
-                      立即学习
+                      {{ course.price === '0.00' ? '免费学习' : '立即学习' }}
                     </router-link>
                   </div>
                 </div>