Refactor FluxImg2ImgReq class to make image and strength attributes optional

app.py

@@ -117,15 +117,15 @@ class FluxReq(BaseModel):
 
 
 class FluxImg2ImgReq(FluxReq):
-    image: Image.Image
-    strength: float = 1.0
+    image: Optional[Image.Image]
+    strength: Optional[float] = 1.0
     
     class Config:
         arbitrary_types_allowed=True
 
 
 class FluxInpaintReq(FluxImg2ImgReq):
-    mask_image: Image.Image
+    mask_image: Optional[Image.Image]
     
     class Config:
         arbitrary_types_allowed=True