feat: log plugin runtime errors

exec/handlers/delete.php

@@ -16,6 +16,7 @@ return static function (AppContext $ctx): void {
             $ctx->audit->record('delete', $ctx->daUser->username(), ['rule_id' => $id, 'subject_prefix' => (string)($rule['subject_prefix'] ?? $rule['subject'] ?? '')]);
             Http::redirect($ctx->url('index.html', ['status' => 'deleted']));
         } catch (Throwable $e) {
+            PluginLogger::exception($e, 'DELETE');
             $ctx->render('Confirm deletion', '<div class="alert alert-err">' . AppContext::e($e->getMessage()) . '</div>');
             return;
         }