feat: add support for together ai

Signed-off-by: Anupam Kumar <kyteinsky@gmail.com>

Author: kyteinsky

lib/Service/OpenAiAPIService.php

@@ -92,8 +92,12 @@ public function getModels(string $userId): array {
 		$modelsResponse = $this->request($userId, 'models');
 		$this->logger->debug('Actually getting OpenAI models with a network request');
 		if (!isset($modelsResponse['data'])) {
-			$this->logger->warning('Error retrieving models: ' . json_encode($modelsResponse));
-			throw new Exception($this->l10n->t('Unknown models error'), Http::STATUS_INTERNAL_SERVER_ERROR);
+			if (!is_array($modelsResponse)) {
+				$this->logger->warning('Error retrieving models: ' . json_encode($modelsResponse));
+				throw new Exception($this->l10n->t('Unknown models error'), Http::STATUS_INTERNAL_SERVER_ERROR);
+			}
+			// also consider responses without 'data' as valid
+			$modelsResponse = ['data' => $modelsResponse];
 		}
 		$cache->set($cacheKey, $modelsResponse, Application::MODELS_CACHE_TTL);
 		$this->modelsMemoryCache = $modelsResponse;