feat: media via AI, text via NormalBot only, ai_for_media toggle

- Text/interactive/button messages → NormalBot only, never escalates to AI
- Image/audio/video/document → AiBot.processMedia() if ai_for_media enabled,
  else falls back to category greeting menu
- AiBot.processMedia() uses permission_type context so AI acknowledges uploads
  for perm 3 and redirects others to their menu
- WpWebhook.handleMedia now calls BotRouter so the bot responds to media
- Admin UI: checkbox toggle "Procesar imágenes y archivos con IA" in AI tab
- categoryMenuFallback() extracted in BotRouter as shared helper

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

services/BotRouter.php

@@ -100,31 +100,46 @@ class BotRouter
         return AiBot::process($company, $context, $input);
     }
 
+    private static function isMediaType(string $inputType): bool
+    {
+        return in_array($inputType, ['image', 'audio', 'video', 'document', 'sticker'], true);
+    }
+
     private static function runHybridBot(array $company, array $context, string $input, string $inputType): ?array
     {
-        $response = self::runNormalBot($company, $context, $input, $inputType);
+        $config = self::getConfig($company);
 
+        // Media (image/audio/video/document) → AI handles it if enabled
+        if (self::isMediaType($inputType)) {
+            $aiEnabled = (bool)($config['ai_for_media'] ?? true);
+            if (!$aiEnabled) {
+                return self::categoryMenuFallback($company, $context, $config);
+            }
+            return AiBot::processMedia($company, $context, $inputType, $input);
+        }
+
+        // Text / interactive / button → NormalBot only, never AI
+        $response = self::runNormalBot($company, $context, $input, $inputType);
         if ($response !== null) {
             return $response;
         }
 
-        // Only escalate to AI if bot type truly needs it; avoid AI for menu-driven bots
-        $config   = self::getConfig($company);
-        $permType = (string)($context['permission_type'] ?? 1);
-        $perType  = $config['per_type'][$permType] ?? [];
+        // NormalBot returned null → show the category greeting menu as fallback
+        return self::categoryMenuFallback($company, $context, $config);
+    }
 
-        // If a greeting_menu is configured for this category, use it as fallback instead of AI
+    private static function categoryMenuFallback(array $company, array $context, array $config): ?array
+    {
+        $permType        = (string)($context['permission_type'] ?? 1);
+        $perType         = $config['per_type'][$permType] ?? [];
         $greetingMenuKey = $perType['greeting_menu'] ?? null;
         if ($greetingMenuKey !== null) {
             $menus = array_merge($config['menus'] ?? [], $perType['menus'] ?? []);
             if (isset($menus[$greetingMenuKey])) {
-                self::log("NormalBot no manejó '{$input}' — mostrando menú de categoría en lugar de IA");
                 return NormalBot::buildGreetingMenu($menus[$greetingMenuKey], $context['from'], $company);
             }
         }
-
-        self::log("NormalBot no manejó '{$input}', escalando a IA");
-        return self::runAiBot($company, $context, $input);
+        return null;
     }
 
     private static function shouldSkipBot(array $company, array $context): bool