feat: add positions management admin tab + career advisor homepage entry

- admin.vue: new '岗位' tab with CRUD list/modal/api functions/styles
- index.vue: add AI择业顾问 entry card linking to career page
- Backend CRUD endpoints already exist, no backend changes needed

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

@@ -43,6 +43,15 @@
           </view>
           <text class="fp-action">开始</text>
         </view>
+        <view class="feature-secondary" style="margin-bottom: 16rpx;">
+          <view class="fs-card card" @click="goCareer">
+            <view class="fs-top">
+              <view class="fs-icon fs-progress"><text class="fs-emoji">🎯</text></view>
+              <text class="fs-name">AI 择业顾问</text>
+            </view>
+            <text class="fs-brief">专业分析 · 岗位匹配 · 智能推荐</text>
+          </view>
+        </view>
         <view class="feature-tertiary">
           <view class="fs-card card" @click="goResume">
             <view class="fs-top">
@@ -246,6 +255,7 @@ const goProgress = () => uni.navigateTo({ url: '/pages/progress/progress' })
 const goContribute = () => uni.navigateTo({ url: '/pages/contribute/contribute' })
 const goBank = () => uni.navigateTo({ url: '/pages/company-bank/bank' })
 const goInternship = () => uni.navigateTo({ url: '/pages/internship/internship' })
+const goCareer = () => uni.navigateTo({ url: '/pages/career/career' })
 
 const startInterview = (pos) => uni.navigateTo({ url: `/pages/interview/interview?position=${encodeURIComponent(pos.name)}` })
 </script>