feat(admin): track capture-to-report conversion funnel

h5/js/admin.js

@@ -169,6 +169,23 @@ function loadRecords() {
 }
 
 /* ═══════════ 失败与异常 ═══════════ */
+function renderCaptureFunnel(st) {
+    var funnel = st.capture_funnel;
+    var panel = $('#capture-funnel');
+    if (funnel && panel) {
+      var labels = [['started','开始拍照'],['front','正面拍完'],['right','右脸拍完'],['left','三张拍完'],['submitted','提交检测'],['response','收到成功结果'],['report','进入报告页']];
+      var html = '<table><thead><tr><th>阶段</th><th>累计流程</th><th>今日流程</th></tr></thead><tbody>';
+      labels.forEach(function (row) { html += '<tr><td>' + row[1] + '</td><td>' + funnel.total.counts[row[0]] + '</td><td>' + funnel.today.counts[row[0]] + '</td></tr>'; });
+      html += '</tbody></table>';
+      html += '<p class="hint">首次采集：' + (funnel.since ? fmtTime(new Date(funnel.since).toISOString()) : '暂无数据') + '</p>';
+      [['total','累计'],['today','今日']].forEach(function (row) {
+        var f = funnel[row[0]];
+        html += '<p>' + row[1] + '：进入报告转化率 ' + f.rate + '% · 成功进入平均耗时 ' + (f.avg_ms == null ? '—' : (f.avg_ms / 1000).toFixed(1) + ' 秒') +
+          ' · 成功结果但未进入 ' + f.response_without_report + ' · 明确失败 ' + f.counts.failed + ' · 主动取消 ' + f.counts.canceled + ' · 发生后台中断 ' + f.counts.interrupted + ' · 尚未完成 ' + f.unfinished + '</p>';
+      });
+      panel.innerHTML = html;
+    }
+}
 function loadFails() {
   api('/api/admin/stats').then(function (st) {
     var box = $('#fail-dist');
@@ -228,6 +245,7 @@ function doRetry(id) {
 var PIE_COLORS = ['#2563eb', '#2fa84f', '#f0a020', '#8a5cf6', '#d93026'];
 function loadStats() {
   api('/api/admin/stats').then(function (st) {
+    renderCaptureFunnel(st);
     var cards = [
       ['今日检测', st.today_total],
       ['累计检测', st.total],