feat(admin): show last login time/IP/location in user list

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

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

@@ -101,6 +101,11 @@
             <text class="time-label" v-if="u.vipExpireAt">到期:{{ u.vipExpireAt?.slice(0,10) }}</text>
             <text class="time-label" v-if="u.sprintExpireAt">冲刺到期:{{ u.sprintExpireAt?.slice(0,10) }}</text>
           </view>
+          <view class="user-meta-row time-row" v-if="u.lastLoginAt">
+            <text class="time-label">最后登录:{{ u.lastLoginAt?.slice(0,16).replace('T',' ') }}</text>
+            <text class="meta-tag" v-if="u.lastLoginIp">IP:{{ u.lastLoginIp }}</text>
+            <text class="meta-tag" v-if="u.lastLoginLocation">{{ u.lastLoginLocation }}</text>
+          </view>
           <view class="user-actions">
             <text class="user-action-btn" v-if="u.plan === 'free'" @click="setVip(u._id)">设为会员</text>
             <text class="user-action-btn credit" @click="openCreditModal(u)">调整额度</text>
@@ -300,6 +305,8 @@
             <text>每月引力值</text>
             <input class="cfg-input" type="digit" v-model.number="pricing.plans.sprint.gravityPerMonth" />
           </view>
+          <view class="cfg-row">
+            <text>面试额度/月</text>
             <input class="cfg-input" type="digit" v-model.number="pricing.plans.sprint.credits.interview" />
           </view>
           <view class="cfg-row">
@@ -539,6 +546,7 @@
               <text class="admin-set-btn done" v-else>已是管理员</text>
             </view>
           </view>
+        </view>
       </view>
     </view>
   </view>
@@ -736,6 +744,7 @@ const switchTab = (t) => {
   if (t === 'pricing') loadPricing()
   if (t === 'orders') loadOrders()
   if (t === 'analysis') loadAnalysis()
+  if (t === 'share') loadShareRecords()
 }
 
 const loadUsers = async () => {