feat: AI岗位专区 — 5个AI岗位置顶 + 首页分组展示

- schema: HotPosition 新增 category 字段 (ai/traditional)
- positions: 5 AI岗位 (AI算法/大模型应用/Prompt/AI产品/AI运维) + 7传统岗位
- frontend: 首页拆分 "🔥 AI热门岗位" 置顶高亮 + "更多岗位" 折叠
- ai服务: 新增 primaryFallbackModel (sensenova-6.7-flash-lite) 降级链路

zhiyin-app/src/pages/index/index.vue

@@ -107,18 +107,49 @@
       </view>
     </view>
 
-    <!-- 热门岗位 -->
+    <!-- 热门岗位 - AI 专区 -->
     <view class="section">
       <view class="section-header">
         <view class="section-title-row">
-          <text class="section-title">热门岗位</text>
+          <text class="section-title">🔥 AI 热门岗位</text>
+          <text class="section-badge">NEW</text>
         </view>
-        <text class="section-desc">点击直接面试</text>
+        <text class="section-desc">AI 时代最热方向，点击直接面试</text>
       </view>
-      <view class="position-list card" v-if="!positionsLoading">
-        <view class="pos-item" v-for="(pos, idx) in hotPositions" :key="idx" @click="startInterview(pos)">
+      <view class="ai-banner card" @click="goInterview">
+        <text class="ai-banner-title">🚀 AI 正在重塑整个行业</text>
+        <text class="ai-banner-desc">大模型应用 / Agent 开发 / Prompt 工程 — 顶尖人才缺口巨大，现在上车正当时</text>
+      </view>
+      <view class="position-list card" v-if="!positionsLoading && aiPositions.length > 0">
+        <view class="pos-item" v-for="(pos, idx) in aiPositions" :key="'ai-' + idx" @click="startInterview(pos)">
           <view class="pos-left">
-            <text class="pos-icon">{{ pos.icon || posIcons[idx % posIcons.length] || '💼' }}</text>
+            <text class="pos-icon pos-icon-ai">{{ pos.icon || posIcons[idx % posIcons.length] || '🤖' }}</text>
+            <view class="pos-body">
+              <text class="pos-name">{{ pos.name }}</text>
+              <view class="pos-meta-row" v-if="pos.company || pos.salary">
+                <text class="pos-company">{{ pos.company }}</text>
+                <text class="pos-salary">{{ pos.salary }}</text>
+              </view>
+            </view>
+          </view>
+          <view class="pos-action">
+            <text class="pos-action-text pos-action-ai">立即模拟</text>
+          </view>
+        </view>
+      </view>
+
+      <!-- 更多岗位 -->
+      <view class="more-header" @click="showMore = !showMore">
+        <view class="more-header-left">
+          <text class="more-icon">🧑‍💻</text>
+          <text class="more-title">更多岗位（{{ traditionalPositions.length }}）</text>
+        </view>
+        <text class="more-arrow">{{ showMore ? '收起 ▲' : '展开 ▼' }}</text>
+      </view>
+      <view class="position-list card" v-if="showMore && !positionsLoading && traditionalPositions.length > 0">
+        <view class="pos-item" v-for="(pos, idx) in traditionalPositions" :key="'tr-' + idx" @click="startInterview(pos)">
+          <view class="pos-left">
+            <text class="pos-icon">{{ pos.icon || posIcons[(aiPositions.length + idx) % posIcons.length] || '💼' }}</text>
             <view class="pos-body">
               <text class="pos-name">{{ pos.name }}</text>
               <view class="pos-meta-row" v-if="pos.company || pos.salary">
@@ -140,7 +171,7 @@
 </template>
 
 <script setup>
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { onShow } from '@dcloudio/uni-app'
 import { api } from '../../config'
 
@@ -151,6 +182,10 @@ const posIcons = ['💻', '⚙️', '🤖', '📊', '🎨', '🧪', '📱', '
 const positionsLoading = ref(true)
 const dailyQuestion = ref(null)
 const showAnswer = ref(false)
+const showMore = ref(false)
+
+const aiPositions = computed(() => hotPositions.value.filter(p => p.category === 'ai'))
+const traditionalPositions = computed(() => hotPositions.value.filter(p => p.category !== 'ai'))
 
 const loadUserInfo = () => {
   try { const s = uni.getStorageSync('userInfo'); if (s) userInfo.value = JSON.parse(s); else userInfo.value = null } catch (e) { userInfo.value = null }
@@ -253,6 +288,7 @@ const startInterview = (pos) => uni.navigateTo({ url: `/pages/interview/intervie
 .section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20rpx; }
 .section-title { font-size: 30rpx; font-weight: 700; color: var(--color-text); }
 .section-title-row { display: flex; align-items: center; gap: 12rpx; }
+.section-badge { font-size: 18rpx; color: #fff; background: var(--color-primary); padding: 2rpx 12rpx; border-radius: 20rpx; font-weight: 500; }
 .section-desc { font-size: 22rpx; color: var(--color-primary); }
 
 .feature-list { display: flex; flex-direction: column; gap: 16rpx; }
@@ -292,12 +328,23 @@ const startInterview = (pos) => uni.navigateTo({ url: `/pages/interview/intervie
 .daily-action { font-size: 24rpx; color: var(--color-text-secondary); }
 .daily-action.primary { color: var(--color-primary); font-weight: 600; }
 
+/* AI 岗位专区 */
+.ai-banner {
+  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
+  padding: 20rpx 24rpx; border-radius: var(--radius-lg); margin-bottom: 16rpx;
+  cursor: pointer;
+}
+.ai-banner:active { transform: scale(0.98); }
+.ai-banner-title { font-size: 26rpx; font-weight: 700; color: #92400E; display: block; margin-bottom: 6rpx; }
+.ai-banner-desc { font-size: 20rpx; color: #A16207; line-height: 1.5; display: block; }
+
 .position-list { border-radius: var(--radius-lg); overflow: hidden; }
 .pos-item { padding: 24rpx 28rpx; border-bottom: 1rpx solid var(--color-border); display: flex; justify-content: space-between; align-items: center; }
 .pos-item:last-child { border-bottom: none; }
 .pos-item:active { background: var(--color-bg); }
 .pos-left { display: flex; align-items: center; gap: 16rpx; flex: 1; min-width: 0; }
 .pos-icon { font-size: 36rpx; width: 56rpx; height: 56rpx; display: flex; align-items: center; justify-content: center; background: #F3F4F6; border-radius: 14rpx; flex-shrink: 0; }
+.pos-icon-ai { background: #FEF3C7; }
 .pos-body { display: flex; flex-direction: column; flex: 1; min-width: 0; }
 .pos-name { font-size: 28rpx; font-weight: 600; color: var(--color-text); }
 .pos-meta-row { display: flex; align-items: center; gap: 10rpx; margin-top: 4rpx; }
@@ -305,6 +352,19 @@ const startInterview = (pos) => uni.navigateTo({ url: `/pages/interview/intervie
 .pos-salary { font-size: 20rpx; color: var(--color-primary); background: #EEF2FF; padding: 2rpx 10rpx; border-radius: 6rpx; }
 .pos-action { flex-shrink: 0; margin-left: 16rpx; }
 .pos-action-text { font-size: 22rpx; color: var(--color-primary); font-weight: 600; }
+.pos-action-ai { color: #D97706; }
+
+/* 更多岗位折叠 */
+.more-header {
+  display: flex; justify-content: space-between; align-items: center;
+  padding: 20rpx 4rpx; margin-top: 8rpx; cursor: pointer;
+}
+.more-header:active { opacity: 0.7; }
+.more-header-left { display: flex; align-items: center; gap: 10rpx; }
+.more-icon { font-size: 28rpx; }
+.more-title { font-size: 26rpx; font-weight: 600; color: var(--color-text-secondary); }
+.more-arrow { font-size: 22rpx; color: var(--color-primary); font-weight: 500; }
+
 .loading-tip { text-align: center; padding: 40rpx; font-size: 24rpx; color: var(--color-text-tertiary); background: #FFF; border-radius: var(--radius-lg); }
 .bottom-spacer { height: 40rpx; }
-</style>
+</style>