refactor(导航): 将内部路由链接替换为外部链接

将HomePage.vue和ActivityCard.vue中的`<router-link>`替换为`<a>`标签和`window.open`方法，以便点击后在新标签页打开外部链接

 <!--
  * @Date: 2025-03-20 20:36:36
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-03-21 17:21:45
+ * @LastEditTime: 2025-03-24 14:32:02
  * @FilePath: /mlaj/src/components/ui/ActivityCard.vue
  * @Description: 文件描述
 -->
 <template>
-  <router-link :to="`/activities/${activity.id}`" class="block mb-4">
+  <div @click="navigateToActivity" class="block mb-4">
     <FrostedGlass class="flex overflow-hidden rounded-xl shadow-sm">
       <!-- Activity Image -->
       <div class="w-1/3 h-28 relative">
@@ -71,19 +71,23 @@
         </div>
       </div>
     </FrostedGlass>
-  </router-link>
+  </div>
 </template>
 
 <script setup>
 import FrostedGlass from './FrostedGlass.vue'
 
-defineProps({
+const props = defineProps({
   activity: {
     type: Object,
     required: true
   }
 })
 
+const navigateToActivity = () => {
+  window.open(`https://example.com/activities/${props.activity.id}`, '_blank')
+}
+
 const getStatusClass = (status) => {
   switch (status) {
     case '活动中':

@@ -303,12 +303,12 @@
           <section class="mb-7">
             <div class="flex justify-between items-center mb-3">
               <h3 class="font-medium">最新活动</h3>
-              <router-link to="/activities" class="text-xs text-gray-500 flex items-center">
+              <a href="https://www.mlaj.com/activities" target="_blank" class="text-xs text-gray-500 flex items-center">
                 更多
                 <svg xmlns="http://www.w3.org/2000/svg" class="h-3 w-3 ml-1" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                   <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
                 </svg>
-              </router-link>
+              </a>
             </div>
             <div class="space-y-4">
               <div v-for="activity in activities.slice(0, 3)" :key="activity.id">