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>

admin/DashboardController.php

@@ -2917,7 +2917,7 @@ HTML;
         <div style="font-weight:700;font-size:13px;color:#0b3d91;margin-bottom:12px">{$label}</div>
         <div class="form-group" style="margin-bottom:0">
           <label>Menú de bienvenida (greeting menu)</label>
-          <select name="per_type_menu[{$cat}]" style="width:100%;padding:9px 12px;border:1px solid #e2e5ea;border-radius:8px;font-size:13px">
+          <select name="per_type_menu[{$cat}]" onchange="savePerType()" style="width:100%;padding:9px 12px;border:1px solid #e2e5ea;border-radius:8px;font-size:13px">
             {$opts}
           </select>
           <div style="font-size:11px;color:#7a8291;margin-top:4px">Menú que se muestra cuando el usuario escribe por primera vez o sin contexto activo</div>
@@ -3491,6 +3491,27 @@ HTML;
 const CONFIG    = {$botConfigJson};
 const ENDPOINTS = {$botEndpointsJson};
 
+function savePerType() {
+  const fd = new FormData();
+  fd.set('company_id', COMPANY_ID);
+  [1, 2, 3].forEach(cat => {
+    const sel = document.querySelector('select[name="per_type_menu[' + cat + ']"]');
+    if (sel) fd.append('per_type_menu[' + cat + ']', sel.value);
+  });
+  fetch('/admin/bot-config/save-per-type', { method: 'POST', body: fd })
+    .then(r => r.json())
+    .then(d => {
+      if (d.ok) {
+        const t = document.createElement('div');
+        t.className = 'toast toast-success';
+        t.textContent = '✅ Categorías guardadas';
+        t.style.cssText = 'position:fixed;bottom:24px;right:24px;z-index:9999;padding:10px 18px;border-radius:8px;background:#166534;color:#fff;font-size:13px;font-weight:600';
+        document.body.appendChild(t);
+        setTimeout(() => t.remove(), 2500);
+      }
+    });
+}
+
 function switchTab(tab, btn) {
   document.querySelectorAll('.tab-content').forEach(t => t.classList.remove('active'));
   document.querySelectorAll('.tab-btn').forEach(t => t.classList.remove('active'));

public/.user.ini

@@ -0,0 +1 @@
+max_input_vars = 5000

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()],