feat: add support for iFLYTEK Spark API (接入讯飞星火模型)

app/api/auth.ts

@@ -88,6 +88,10 @@ export function auth(req: NextRequest, modelProvider: ModelProvider) {
       case ModelProvider.Moonshot:
         systemApiKey = serverConfig.moonshotApiKey;
         break;
+      case ModelProvider.Iflytek:
+        systemApiKey =
+          serverConfig.iflytekApiKey + ":" + serverConfig.iflytekApiSecret;
+        break;
       case ModelProvider.GPT:
       default:
         if (req.nextUrl.pathname.includes("azure/deployments")) {