feat: merge Survey into Scanning and harden live recon

- Delete the Survey stack (sampler, handlers, routes, view, recordings);
  Scanning gains AP compare (cap 6), whole-page selection filter, channel
  map (20 MHz lobes, the radio does not report width), and auto-follow
  that prefers the newest non-empty scan
- Richer HTML scan reports: stat cards, band/encryption breakdowns,
  channel occupancy, color-coded signal cells, GPS line only on a fix
- Harden live recon: bounded + retried scan-detail reads (503 on lock),
  serialize recon starts (409 + scan_remaining while running), GPS and
  archive discovery move to a 30s poll, GPS_GET skipped when gpsd is down
- Read-only history for pineapd-rotated databases (error-*/diagnostic-*):
  archives list/detail/download endpoints, Previous Scans optgroup,
  delete disabled, traversal-guarded
- Status flags: hopper-radio-offline and history-reset banners; empty
  scans greyed in the picker
- Tests: recon suite grows to 99 cases; all 14 modules green

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

payload/user/remote_access/pager-webui/www/js/app.js

@@ -84,6 +84,10 @@ const App = (() => {
   function route() {
     closeToolbarMenus();
     const hash = (location.hash || '#/dashboard').replace(/\/+$/, '');
+    if (hash === '#/recon/survey') {
+      location.hash = '#/recon';
+      return;
+    }
     const name = routes[hash];
     if (currentView && currentView.destroy) currentView.destroy();
     els.content.innerHTML = '';
@@ -396,7 +400,6 @@ const App = (() => {
     '#/pineap/clients': 'pineap_clients',
     '#/pineap/filtering': 'pineap_filtering',
     '#/recon': 'recon',
-    '#/recon/survey': 'recon_survey',
     '#/recon/reports': 'recon_reports',
     '#/recon/handshakes': 'recon_handshakes',
     '#/logging': 'logging',