Refactor UI structure and fix typo in SDReq class

src/tasks/images/sd.py

@@ -53,7 +53,7 @@ class SDReq(BaseModel):
     loras: Optional[list] = []
     embeddings: Optional[list] = []
     resize_mode: Optional[str] = "resize_and_fill" # resize_only, crop_and_resize, resize_and_fill
-    scheduler = Optional[str] = "euler_fl"
+    scheduler: Optional[str] = "euler_fl"
     height: int = 1024
     width: int = 1024
     num_images_per_prompt: int = 1