feat: admin audit logging across all admin actions

- AdminLogger: JSON-lines → /var/log/xamxam.log (prod) / storage/logs/admin.log (dev)
  + best-effort DB mirror to admin_audit_log table
- DB: admin_audit_log table, share_links.is_archived column
- ShareLink: archive() replaces delete(), toggleActive() returns new state,
  listActive()/listArchived() split, validateLink blocks archived slugs
- All action handlers wired: publish, unpublish, visibility, delete, csv/db export,
  tfe add/edit, tags, pages, apropos, form-help, access-request, maintenance,
  settings (formulaire toggles, objet types, smtp update), smtp-test
- acces.php: archive button replaces delete; collapsible archived links section
- setup-server.sh: provision /var/log/xamxam.log (www-data:xamxam 640)

app/public/admin/actions/delete.php

@@ -5,6 +5,7 @@ require_once __DIR__ . '/../../../src/AdminAuth.php';
 AdminAuth::requireLogin();
 
 require_once __DIR__ . '/../../../src/Database.php';
+require_once __DIR__ . '/../../../src/AdminLogger.php';
 
 // CSRF validation
 if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
@@ -20,8 +21,11 @@ $isDeleteAll = !empty($_POST['delete_all']);
 try {
     $db = new Database();
 
+    $logger = AdminLogger::make();
+
     if ($isDeleteAll) {
         $count = $db->deleteAllTheses();
+        $logger->logDeleteAllTheses($count);
         App::flash('success', "$count TFE(s) supprimé(s) avec succès.");
 
     } elseif ($isBulk) {
@@ -34,6 +38,7 @@ try {
         }
 
         $db->bulkDeleteTheses($ids);
+        $logger->logDelete(array_values($ids));
         $count = count($ids);
         App::flash('success', "$count TFE(s) supprimé(s) avec succès.");
 
@@ -47,6 +52,7 @@ try {
         }
 
         $db->deleteThesis($thesisId);
+        $logger->logDelete([$thesisId]);
         App::flash('success', 'TFE supprimé avec succès.');
     }