```

feat(api): 将默认图片尺寸从2160x3840调整为2048x2048

- 修改blueprints/api.py中的默认size参数从2160x3840改为2048x2048
- 更新static/js/main.js中GPT_IMAGE_EDIT_MODEL对应的默认尺寸值
- 调整templates/mobile.html中移动端页面的默认尺寸配置
```

blueprints/api.py

@@ -98,7 +98,7 @@ def generate():
                 "prompt": prompt,
                 "model": model_value,
                 "images": [{"image_url": img} for img in image_data],
-                "size": data.get("size") or "2160x3840",
+                "size": data.get("size") or "2048x2048",
                 "quality": "high",
                 "output_format": "png",
             }

static/js/main.js

@@ -484,7 +484,7 @@ function updateSizeOptions() {
     fillSelect('sizeSelect', nextSizes);
 
     if (selectedModel === GPT_IMAGE_EDIT_MODEL) {
-        sizeSelect.value = '2160x3840';
+        sizeSelect.value = '2048x2048';
     } else if (nextSizes.some(item => item.value === previousValue)) {
         sizeSelect.value = previousValue;
     }

templates/mobile.html

@@ -475,7 +475,7 @@
                 const nextSizes = selectedModel === GPT_IMAGE_EDIT_MODEL ? GPT_IMAGE_EDIT_SIZES : defaultSizeOptions;
                 fillSelect('sizeSelect', nextSizes);
                 if (selectedModel === GPT_IMAGE_EDIT_MODEL) {
-                    sizeSelect.value = '2160x3840';
+                    sizeSelect.value = '2048x2048';
                 } else if (nextSizes.some(item => item.value === previousValue)) {
                     sizeSelect.value = previousValue;
                 }