feat: one-shot audio entity extraction y pre-fill de formularios

- AiBot: NLU ahora extrae entities (finca, valor, etc.) del audio
- BotRouter: guarda __nlu_entities en metadata antes de enrutar
- NormalBot: handleCollectAndPost pre-rellena campos desde entities
  y capAskNext salta los ya completados
- NormalBot: handleCollectForEach registra ítem directo si entities
  trae finca+valor coincidente, sin iterar todo el listado
- BotRouter: mid-flow audio va a NormalBot directamente (no NLU)

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

services/BotRouter.php

@@ -174,11 +174,18 @@ class BotRouter
         $result = AiBot::routeOrChat($company, $context, $input);
 
         if ($result['action'] === 'route') {
-            $key    = $result['key'];
-            $botCtx = ConversationContext::getOrCreate((int)$company['id'], $context['from'], 'normal');
-            ConversationContext::updateNode((int)$botCtx['id'], $key);
+            $key      = $result['key'];
+            $botCtx   = ConversationContext::getOrCreate((int)$company['id'], $context['from'], 'normal');
+            $ctxId    = (int)$botCtx['id'];
+            $entities = $result['entities'] ?? [];
+            if (!empty($entities)) {
+                $m = ConversationContext::getMetadata($ctxId);
+                $m['__nlu_entities'] = $entities;
+                ConversationContext::updateMetadata($ctxId, $m);
+                self::log("NLU: entities extraídas → " . json_encode($entities));
+            }
+            ConversationContext::updateNode($ctxId, $key);
             self::log("NLU: {$context['from']} → flow [{$key}]");
-            // Ejecutar con input vacío — NormalBot retoma current_node
             return NormalBot::process($company, $context, '');
         }