perf: 子标签页按需加载（代码与元素懒加载）

原 v-show + 静态 import 导致三个子标签页的组件代码全部打进 MobileGame
chunk，且首屏即渲染全部（排行榜 onMounted 立即发 AJAX、视频元数据加载）。

改为：
- 三个标签页内容拆为独立组件 TeamLeaderboardTab/IterationsTab/ExperimentTab
- MobileGame 用 defineAsyncComponent + 动态 import，Vite 拆成独立 chunk
- v-if + Suspense：未激活的标签页组件根本不挂载（不发 AJAX、不渲染）
构建产物可见三个独立 chunk；headless 验证：默认团队页仅加载 team chunk，
点迭代记录才加载 IterationsTab chunk，点实验才加载 ExperimentTab chunk。

src/modules/mobile-game/MobileGame.vue

@@ -1,18 +1,12 @@
 <script setup>
-import { ref } from 'vue'
+import { ref, defineAsyncComponent } from 'vue'
 import { useI18n } from 'vue-i18n'
 import HeroSection from './components/HeroSection.vue'
 import ScreenshotCarousel from './components/ScreenshotCarousel.vue'
 import SubTabs from './components/SubTabs.vue'
-import VersionTimeline from './components/VersionTimeline.vue'
-import TeamCard from './components/TeamCard.vue'
-import Leaderboard from './components/Leaderboard.vue'
 
 const { locale } = useI18n({ useScope: 'global' })
 const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
-// 站点根绝对路径，用绑定避免被 Vite 当作构建期静态资源解析
-const videoPoster = '/448/2.jpg'
-const videoSrc = '/448/ml/449ml.mp4'
 
 // 子标签页：默认显示团队+排行榜
 const subTabs = [
@@ -21,6 +15,13 @@ const subTabs = [
   { id: 'experiment', label: { zh: '实验', en: 'Experiment' } }
 ]
 const activeTab = ref('team')
+
+// ★ 按需加载：三个子标签页用 defineAsyncComponent 动态 import，
+// 被 Vite/Rollup 拆成独立 chunk，只有切到对应标签页时才下载与渲染。
+// 配合 v-if，未激活的标签页组件根本不挂载（不执行 setup、不发 AJAX）。
+const TeamLeaderboardTab = defineAsyncComponent(() => import('./components/TeamLeaderboardTab.vue'))
+const IterationsTab = defineAsyncComponent(() => import('./components/IterationsTab.vue'))
+const ExperimentTab = defineAsyncComponent(() => import('./components/ExperimentTab.vue'))
 </script>
 
 <template>
@@ -55,52 +56,18 @@ const activeTab = ref('team')
         </div>
       </section>
 
-      <!-- 子标签页区域 -->
+      <!-- 子标签页区域：按需加载，v-if 确保未激活的不渲染 -->
       <section class="block">
         <SubTabs v-model="activeTab" :tabs="subTabs" />
 
-        <!-- 团队 + 排行榜（默认） -->
+        <Suspense>
-        <div v-show="activeTab === 'team'" class="block--two">
+          <TeamLeaderboardTab v-if="activeTab === 'team'" />
-          <div>
+          <IterationsTab v-else-if="activeTab === 'iterations'" />
-            <h2 class="section-title">
+          <ExperimentTab v-else-if="activeTab === 'experiment'" />
-              <small>{{ L('团队', 'Team') }}</small>
+          <template #fallback>
-              {{ L('成员', 'Members') }}
+            <div class="tab-loading">{{ L('加载中…', 'Loading…') }}</div>
-            </h2>
+          </template>
-            <TeamCard />
+        </Suspense>
-          </div>
-          <div>
-            <h2 class="section-title">
-              <small>{{ L('排行榜', 'Leaderboard') }}</small>
-              {{ L('玩家分数 Top 30', 'Top 30 Scores') }}
-            </h2>
-            <Leaderboard />
-          </div>
-        </div>
-
-        <!-- 迭代记录 -->
-        <div v-show="activeTab === 'iterations'">
-          <h2 class="section-title">
-            <small>{{ L('版本演进', 'Version History') }}</small>
-            {{ L('迭代记录', 'Iteration Record') }}
-          </h2>
-          <VersionTimeline />
-        </div>
-
-        <!-- 实验 -->
-        <div v-show="activeTab === 'experiment'">
-          <h2 class="section-title">
-            <small>{{ L('实验', 'Experiment') }}</small>
-            {{ L('ML-Agents 强化学习演示', 'ML-Agents Reinforcement Learning Demo') }}
-          </h2>
-          <div class="video-wrap">
-            <video controls preload="none" :poster="videoPoster">
-              <source :src="videoSrc" type="video/mp4" />
-            </video>
-            <p class="video-caption">
-              {{ L('胶囊体经 ML-Agents 训练，学习保球不掉与越障。', 'Capsules trained via ML-Agents to keep the ball from falling and to navigate obstacles.') }}
-            </p>
-          </div>
-        </div>
       </section>
     </div>
   </div>
@@ -129,36 +96,15 @@ const activeTab = ref('team')
 .block__text p:last-child {
   margin-bottom: 0;
 }
-.block--two {
+.tab-loading {
-  display: grid;
+  padding: var(--space-xl);
-  grid-template-columns: 1fr 1fr;
+  text-align: center;
-  gap: var(--space-xl);
+  color: var(--text-tertiary);
-  align-items: start;
+  font-size: 0.9rem;
-}
-
-.video-wrap {
-  border: 1px solid var(--border);
-  border-radius: var(--radius);
-  overflow: hidden;
-  background: var(--surface);
-  box-shadow: var(--shadow-sm);
-}
-.video-wrap video {
-  width: 100%;
-  display: block;
-  aspect-ratio: 16 / 9;
-  background: #000;
-}
-.video-caption {
-  padding: var(--space-md) var(--space-lg);
-  font-size: 0.88rem;
-  color: var(--text-secondary);
-  margin: 0;
 }
 
 @media (max-width: 768px) {
-  .block__grid,
+  .block__grid {
-  .block--two {
     grid-template-columns: 1fr;
   }
 }

src/modules/mobile-game/components/ExperimentTab.vue

@@ -0,0 +1,48 @@
+<script setup>
+import { useI18n } from 'vue-i18n'
+
+const { locale } = useI18n({ useScope: 'global' })
+const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
+// 站点根绝对路径，用绑定避免被 Vite 当作构建期静态资源解析
+const videoPoster = '/448/2.jpg'
+const videoSrc = '/448/ml/449ml.mp4'
+</script>
+
+<template>
+  <div class="tab-experiment">
+    <h2 class="section-title">
+      <small>{{ L('实验', 'Experiment') }}</small>
+      {{ L('ML-Agents 强化学习演示', 'ML-Agents Reinforcement Learning Demo') }}
+    </h2>
+    <div class="video-wrap">
+      <video controls preload="none" :poster="videoPoster">
+        <source :src="videoSrc" type="video/mp4" />
+      </video>
+      <p class="video-caption">
+        {{ L('胶囊体经 ML-Agents 训练，学习保球不掉与越障。', 'Capsules trained via ML-Agents to keep the ball from falling and to navigate obstacles.') }}
+      </p>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.video-wrap {
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  overflow: hidden;
+  background: var(--surface);
+  box-shadow: var(--shadow-sm);
+}
+.video-wrap video {
+  width: 100%;
+  display: block;
+  aspect-ratio: 16 / 9;
+  background: #000;
+}
+.video-caption {
+  padding: var(--space-md) var(--space-lg);
+  font-size: 0.88rem;
+  color: var(--text-secondary);
+  margin: 0;
+}
+</style>

src/modules/mobile-game/components/IterationsTab.vue

@@ -0,0 +1,17 @@
+<script setup>
+import { useI18n } from 'vue-i18n'
+import VersionTimeline from './VersionTimeline.vue'
+
+const { locale } = useI18n({ useScope: 'global' })
+const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
+</script>
+
+<template>
+  <div class="tab-iterations">
+    <h2 class="section-title">
+      <small>{{ L('版本演进', 'Version History') }}</small>
+      {{ L('迭代记录', 'Iteration Record') }}
+    </h2>
+    <VersionTimeline />
+  </div>
+</template>

src/modules/mobile-game/components/TeamLeaderboardTab.vue

@@ -0,0 +1,41 @@
+<script setup>
+import { useI18n } from 'vue-i18n'
+import TeamCard from './TeamCard.vue'
+import Leaderboard from './Leaderboard.vue'
+
+const { locale } = useI18n({ useScope: 'global' })
+const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
+</script>
+
+<template>
+  <div class="tab-team block--two">
+    <div>
+      <h2 class="section-title">
+        <small>{{ L('团队', 'Team') }}</small>
+        {{ L('成员', 'Members') }}
+      </h2>
+      <TeamCard />
+    </div>
+    <div>
+      <h2 class="section-title">
+        <small>{{ L('排行榜', 'Leaderboard') }}</small>
+        {{ L('玩家分数 Top 30', 'Top 30 Scores') }}
+      </h2>
+      <Leaderboard />
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.block--two {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: var(--space-xl);
+  align-items: start;
+}
+@media (max-width: 768px) {
+  .block--two {
+    grid-template-columns: 1fr;
+  }
+}
+</style>