feat: 登录页密码+验证码双模式 / 首页岗位优化 / 法律页面 / 后端接口完善

- 前端：登录页重构，支持密码登录、验证码登录、注册三种模式
- 前端：首页热门岗位添加「参考示例」标签，去虚构数据
- 前端：面试页顶部优化，岗位名+状态标签展示
- 前端：新增用户协议、隐私政策页面及免责声明
- 后端：新增 POST /api/user/register 注册接口
- 后端：新增 POST /api/user/set-password 设置密码接口
- 后端：修复 user.schema.ts unique 索引导致 null 冲突问题
- 后端：新增 payment-order.schema、positions.schema、site-config.schema
- 后端：package.json 新增 postbuild 脚本自动复制证书
- 管理后台：新增订单管理 Tab

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

@@ -5,6 +5,10 @@
       <view class="topbar-inner">
         <view class="back-btn" @click="confirmExit"><text class="back-arrow">‹</text></view>
         <view class="topbar-center">
+          <view class="topbar-pos-row">
+            <text class="topbar-position">{{ position || 'AI面试' }}</text>
+            <text class="topbar-status">面试中</text>
+          </view>
           <view class="progress-track" v-if="interviewId">
             <view class="progress-fill" :style="{ width: progressPercent + '%' }"></view>
           </view>
@@ -43,6 +47,8 @@
         <text class="send-icon">➤</text>
       </view>
     </view>
+    <!-- AI 免责提示 -->
+    <view class="disclaimer-bar" v-if="!isComplete">AI 生成内容仅供参考，请核实重要信息</view>
 
     <!-- Complete -->
     <view class="complete-bar" v-else>
@@ -56,14 +62,14 @@ import { ref, computed, onMounted, onBeforeUnmount, nextTick } from 'vue'
 import { onLoad } from '@dcloudio/uni-app'
 import { api } from '../../config'
 
-const messages = ref([{ role: 'ai', content: '你好！我是 AI 面试官，准备好就开始吧！' }])
+const messages = ref([{ role: 'ai', content: '你好！我是 AI 面试官，请选择岗位开始模拟面试！' }])
 const inputText = ref('')
 const aiLoading = ref(false)
 const interviewId = ref('')
 const answeredCount = ref(0)
 const isComplete = ref(false)
 const scrollToId = ref('')
-const position = ref('通用岗位')
+const position = ref('')
 let timerSeconds = 0
 let timerInterval = null
 
@@ -75,7 +81,11 @@ const formatTime = computed(() => {
 const token = computed(() => uni.getStorageSync('token') || '')
 
 onLoad((options) => {
-  if (options?.position) position.value = decodeURIComponent(options.position)
+  if (options?.position) {
+    const pos = decodeURIComponent(options.position)
+    position.value = pos
+    messages.value = [{ role: 'ai', content: `你好！我是你的专属 ${pos} 面试官，准备好了就开始吧！` }]
+  }
 })
 
 onMounted(() => { timerInterval = setInterval(() => timerSeconds++, 1000); if (token.value) startInterview() })
@@ -151,9 +161,12 @@ const confirmExit = () => {
 }
 .back-arrow { font-size: 36rpx; color: #FFFFFF; font-weight: 300; line-height: 1; }
 .topbar-center { flex: 1; display: flex; flex-direction: column; gap: 8rpx; }
+.topbar-pos-row { display: flex; align-items: center; gap: 10rpx; }
+.topbar-position { font-size: 26rpx; color: #FFFFFF; font-weight: 600; }
+.topbar-status { font-size: 18rpx; color: #FFFFFF; background: rgba(255,255,255,0.2); padding: 2rpx 12rpx; border-radius: 20rpx; }
 .progress-track { height: 6rpx; background: rgba(255,255,255,0.2); border-radius: 3rpx; overflow: hidden; }
 .progress-fill { height: 100%; background: #FFFFFF; border-radius: 3rpx; transition: width 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94); }
-.topbar-timer { font-size: 22rpx; color: rgba(255,255,255,0.8); font-variant-numeric: tabular-nums; }
+.topbar-timer { font-size: 20rpx; color: rgba(255,255,255,0.7); font-variant-numeric: tabular-nums; }
 .topbar-right { width: 60rpx; flex-shrink: 0; }
 
 /* ===== Chat ===== */
@@ -207,4 +220,5 @@ const confirmExit = () => {
 /* Complete */
 .complete-bar { background: #FFFFFF; padding: 20rpx 24rpx; padding-bottom: calc(20rpx + var(--safe-bottom)); }
 .cta-btn { width: 100%; height: 88rpx; line-height: 88rpx; background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-mid)); color: #FFFFFF; border-radius: var(--radius-md); font-size: 28rpx; font-weight: 600; border: none; }
+.disclaimer-bar { text-align: center; font-size: 20rpx; color: var(--color-text-tertiary); padding: 8rpx 24rpx; background: #FFFFFF; border-top: 1rpx solid var(--color-border); }
 </style>