feat: per-category greeting menu in bot config

Add a "Por Categoría" tab in the bot config UI where each permission
category (1, 2, 3) can be assigned its own greeting button menu.
When a user writes without an active context, the bot shows the menu
configured for their category instead of falling through to the global
greeting text.

NormalBot.process() now checks per_type[X].greeting_menu first, which
directly references a menu key and serves as both greeting and fallback
for that category. Fully backward-compatible with existing greeting_flow.

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

services/NormalBot.php

@@ -46,6 +46,13 @@ class NormalBot
             return null;
         }
 
+        // Per-type greeting_menu: direct menu for this category (greeting + fallback in one)
+        $greetingMenuKey = $perType['greeting_menu'] ?? null;
+        if ($greetingMenuKey !== null && $currentNode === null && isset($menus[$greetingMenuKey])) {
+            ConversationContext::updateNode($ctxId, null);
+            return self::buildMenuResponse($menus[$greetingMenuKey], $context['from'], $company);
+        }
+
         $greeting = $perType['greeting'] ?? $config['greeting'] ?? null;
         if ($greeting !== null && $currentNode === null) {
             $greetingFlowId = $perType['greeting_flow'] ?? 'greeting';
@@ -65,6 +72,12 @@ class NormalBot
             return self::handleFlow($flows[$fallbackFlowId], $context, $company, $ctxId, $menus);
         }
 
+        // greeting_menu also serves as fallback when nothing else matched
+        if ($greetingMenuKey !== null && isset($menus[$greetingMenuKey])) {
+            ConversationContext::updateNode($ctxId, null);
+            return self::buildMenuResponse($menus[$greetingMenuKey], $context['from'], $company);
+        }
+
         $fallback = $perType['fallback'] ?? $config['fallback'] ?? null;
         if ($fallback !== null) {
             ConversationContext::updateNode($ctxId, null);