fix(project): remove statistics list explanation banner

Remove the explanatory alert above the statistics table as requested, keeping the separate presign count and existing statistics behavior.

web-admin/src/views/project-management/statistics/index.vue

@@ -32,11 +32,6 @@
           ></el-form
         ></div
       >
-      <el-alert
-        title="按业务主单计数，各业务量不代表独立客户人数；预签约单独统计。点击数量查看对应明细。"
-        type="info"
-        :closable="false"
-      />
       <div class="list-body list-wrap"
         ><el-table :data="displayRows" v-loading="loading" class="list-table" stripe>
           <el-table-column