Default OpenAI image-generation model to gpt-image-1 (previously dall-e-3)

src/agent/provider/openai/config.rs

@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 
 use crate::agent::{default_prompt, provider::ConfigTrait};
+use super::OPENAI_IMAGE_MODEL_GPT_IMAGE_1;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Config {
@@ -161,7 +162,7 @@ pub struct ImageGenerationConfig {
 impl Default for ImageGenerationConfig {
     fn default() -> Self {
         Self {
-            model_id: "dall-e-3".to_owned(),
+            model_id: OPENAI_IMAGE_MODEL_GPT_IMAGE_1.to_owned(),
             style: default_image_style(),
             size: default_image_size(),
             quality: default_image_quality(),