feat: 调用gpt\nano模型方式修改，功能优化，增加下载采集图片等功能

server/config.py

@@ -41,14 +41,12 @@ class Settings(BaseSettings):
     dashscope_base_url: str = ""        # 留空按模型自动选择万象异步/千问同步端点
     dashscope_model: str = "wan2.7-image-pro"
 
-    # RightAPI（OpenAI 兼容中转，gpt-image 系列）
+    # RightAPI（OpenAI 兼容中转，gpt-image / nano-banana 系列）
     rightapi_api_key: str = ""
     rightapi_base_url: str = "https://rightapi.ai/draw"
     rightapi_image_model: str = "gpt-image-2"
-    rightapi_image_quality: str = "high"  # auto | low | medium | high
     rightapi_max_retries: int = 3         # 429/5xx/超时的重试次数（1 = 不重试）
     rightapi_retry_wait: int = 60         # 重试基础等待秒数，按 60→120→240 递增
-    rightapi_input_fidelity: str = "high"  # edits 端点高保真档（high | low，留空关闭）
 
     # DeepSeek（出图方案规划器）
     deepseek_api_key: str = ""