优化默认的生图提示词前缀

README.md

@@ -152,7 +152,7 @@ uv run streamlit run web/app.py
 
 **提示词前缀（Prompt Prefix）**  
 - 控制图像的整体风格（语言需要是英文的）
-- 例如：Pure white background, minimalist illustration, matchstick figure style, black and white line drawing, simple clean lines
+- 例如：Minimalist black-and-white stick figure illustration on a plain white background, clean thin lines, simple sketch style
 - 点击「预览风格」可以测试效果
 
 #### 视频模板

config.example.yaml

@@ -35,4 +35,4 @@ comfyui:
     default_workflow: runninghub/image_flux.json
     
     # Image prompt prefix (optional)
-    prompt_prefix: "Pure white background, minimalist illustration, matchstick figure style, black and white line drawing, simple clean lines"
+    prompt_prefix: "Minimalist black-and-white stick figure illustration on a plain white background, clean thin lines, simple sketch style"

pixelle_video/config/schema.py

@@ -23,7 +23,7 @@ class ImageSubConfig(BaseModel):
     """Image-specific configuration (under comfyui.image)"""
     default_workflow: Optional[str] = Field(default=None, description="Default image workflow (optional)")
     prompt_prefix: str = Field(
-        default="Pure white background, minimalist illustration, matchstick figure style, black and white line drawing, simple clean lines",
+        default="Minimalist black-and-white stick figure illustration on a plain white background, clean thin lines, simple sketch style",
         description="Prompt prefix for all image generation"
     )