feat: 新增豆包5.0生图模型节点

- 新增 DoubaoImage 节点，支持豆包 5.0 文生图模型
- 新增 clients/doubao_image_client.py 封装豆包图像生成 API
- 新增 nodes/doubao_image.py 节点逻辑实现
- 注册节点映射及显示名称「豆包生图」

__init__.py

@@ -21,7 +21,7 @@ except Exception:
 
 import ssl
 
-from .nodes import NanoBananaPro, BatchNanoBananaPro, GoogleGemini, LoadFile, ImageStitchPro, SaveCleanImage, BatchCleanMetadata, VideoPreview, GoogleVeo, FluxImageEdit, UniversalLLMChat, KlingVideo, KlingFirstLastFrame, KlingMotionControlTest, AspectRatioPreset, MultiResPreview, BatchImagesO1key, Seedance, SeedanceMultiModal, StreamPreview
+from .nodes import NanoBananaPro, BatchNanoBananaPro, GoogleGemini, LoadFile, ImageStitchPro, SaveCleanImage, BatchCleanMetadata, VideoPreview, GoogleVeo, FluxImageEdit, UniversalLLMChat, KlingVideo, KlingFirstLastFrame, KlingMotionControlTest, AspectRatioPreset, MultiResPreview, BatchImagesO1key, Seedance, SeedanceMultiModal, StreamPreview, DoubaoImage
 
 # 报错弹框友好文案（不修改原节点代码，仅在外层统一处理）
 _MSG_TIMEOUT = "API 请求超时，请稍后重试或检查网络。"
@@ -78,6 +78,7 @@ NODE_CLASS_MAPPINGS = {
     "Seedance": Seedance,
     "SeedanceMultiModal": SeedanceMultiModal,
     "StreamPreview": StreamPreview,
+    "DoubaoImage": DoubaoImage,
 }
 
 NODE_DISPLAY_NAME_MAPPINGS = {
@@ -101,6 +102,7 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "Seedance": "Seedance 视频生成",
     "SeedanceMultiModal": "Seedance 多模态参考生视频",
     "StreamPreview": "流式文本预览",
+    "DoubaoImage": "豆包生图",
 }
 
 WEB_DIRECTORY = "./web"