package com.example.pap; import retrofit2.Retrofit; import retrofit2.converter.gson.GsonConverterFactory; public class AiConfig { private static Retrofit retrofit; private static final String BASE_URL = "https://openrouter.ai/api/v1/"; public static Retrofit getRetrofit() { if (retrofit == null) { retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .build(); } return retrofit; } }