perf: 清理无界缓存、合并收益走势查询、补齐组合索引并优化前端定时器/图片加载

- 移除只写不读的 verifyCodeCache（无界内存增长）

- 大神收益走势由 20 次逐日/逐周/逐月查询改为 3 次 GROUP BY 聚合

- 派单池地理编码改为并行，避免串行等待外部接口

- 补齐 orders/activities/participants/user_notifications/finance/withdrawals/posts 组合索引；修复 withdrawals 使用不存在 created_at 的失效索引

- 数据库连接池支持 MYSQL_CONNECTION_LIMIT/MYSQL_QUEUE_LIMIT

- 首页/弹窗定时器卸载清理，活动列表参与者按活动 id 查询，大厅组局按页取数，图片 lazy-load

- 121 套件/792 用例全绿；已部署并验证新索引与 9ms 走势查询

pwuniapp/components/HomePopupModal.vue

@@ -29,12 +29,13 @@
 </template>
 
 <script setup>
-import { ref, computed, onMounted } from 'vue';
+import { ref, computed, onMounted, onUnmounted } from 'vue';
 import { ICONS } from '@/common/icons.js';
 import { getCurrentThemeKey } from '@/common/theme.js';
 import { getPlatformConfigs } from '@/common/api.js';
 
 const visible = ref(false);
+let popupTimer = null;
 const config = ref({
   enabled: false,
   title: '',
@@ -81,7 +82,8 @@ const checkAndDisplayPopup = async () => {
     }
 
     // 延迟 600ms 展示，保证首屏骨架屏转场顺畅
-    setTimeout(() => {
+    if (popupTimer) clearTimeout(popupTimer);
+    popupTimer = setTimeout(() => {
       visible.value = true;
       uni.setStorageSync(storageKey, String(now));
     }, 600);
@@ -107,6 +109,13 @@ const handleAction = () => {
 onMounted(() => {
   checkAndDisplayPopup();
 });
+
+onUnmounted(() => {
+  if (popupTimer) {
+    clearTimeout(popupTimer);
+    popupTimer = null;
+  }
+});
 </script>
 
 <style>