fix: stop repeated/duplicate bot responses

Root cause: WpWebhook called OutboundWorker::processQueue() after every
incoming message. BotRouter already sends synchronously in enqueueResponse();
failed messages stayed status='queued'. On the next incoming message
processQueue() would re-send ALL previously-failed messages, causing
the bot to repeat old responses.

- Remove OutboundWorker::processQueue() from WpWebhook::processEvent()
  BotRouter handles immediate delivery; retries should be manual/cron only
- Fix chatSend(): instead of queuing + processQueue() (which drains ALL
  queued messages), call WhatsAppSender::sendText() directly for the
  one message being sent

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

admin/v1/WpWebhook.php

@@ -144,13 +144,9 @@ class WpWebhook
 
         // Persistir evento crudo para auditoría
         self::saveRawEvent($raw);
-
-        // Procesar cola outbound inmediatamente para respuestas automáticas
-        try {
-            OutboundWorker::processQueue();
-        } catch (\Throwable $e) {
-            self::log('WARN', 'OutboundWorker falló: ' . $e->getMessage());
-        }
+        // Note: BotRouter already sends synchronously in enqueueResponse().
+        // Running processQueue() here would re-send ALL previously-failed messages
+        // on every incoming webhook, causing duplicate/repeated responses.
     }
 
     private static function resolveCompany(array $payload): void