fix: save per-category menus via dedicated endpoint, not the main form

The main form exceeded max_input_vars (27 flows × 37 fields each) so PHP
silently dropped per_type_menu before reaching the save handler.

- Add POST /admin/bot-config/save-per-type — reads existing DB config,
  merges only the per_type_menu values, saves back
- Per-type selects fire savePerType() onchange → AJAX → toast on success
- Add public/.user.ini with max_input_vars=5000 as belt+suspenders
- Remove array_is_list() (PHP 8.1) — replaced with PHP 7.4 compatible check

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/index.php

@@ -570,6 +570,40 @@ $routes = [
         exit;
     })()],
 
+    // ─── Admin: guardar per_type por categoría (endpoint separado) ───────────
+    ['POST', '/admin/bot-config/save-per-type', fn() => (function () {
+        SessionAuth::require();
+        header('Content-Type: application/json; charset=utf-8');
+        $companyId = (int)($_POST['company_id'] ?? 0);
+        if ($companyId === 0) { echo json_encode(['ok' => false]); exit; }
+
+        $company = CompanyRepository::findById($companyId);
+        if (!$company) { echo json_encode(['ok' => false]); exit; }
+
+        $config = json_decode($company['config_json'] ?? '{}', true) ?: [];
+
+        $rawPt = $config['per_type'] ?? [];
+        $perType = (is_array($rawPt) && count(array_filter(array_keys($rawPt), 'is_string')) > 0)
+                   ? $rawPt : [];
+
+        $perTypeMenus = $_POST['per_type_menu'] ?? [];
+        foreach ([1, 2, 3] as $cat) {
+            $mk  = trim($perTypeMenus[$cat] ?? '');
+            $key = (string)$cat;
+            if ($mk !== '') {
+                $perType[$key] = array_merge($perType[$key] ?? [], ['greeting_menu' => $mk]);
+            } else {
+                unset($perType[$key]['greeting_menu']);
+                if (empty($perType[$key])) unset($perType[$key]);
+            }
+        }
+        $config['per_type'] = empty($perType) ? new stdClass() : $perType;
+
+        CompanyRepository::save(['id' => $companyId, 'config_json' => json_encode($config, JSON_UNESCAPED_UNICODE)]);
+        echo json_encode(['ok' => true]);
+        exit;
+    })()],
+
     // ─── Admin: configuración general ──────────────────────────────────────
     ['GET', '/admin/settings', fn() => DashboardController::settings()],