Fix: use @api.post for /api/image-edit endpoint registration

app.py

@@ -390,7 +390,7 @@ _register_attribute_endpoint("/api/orange-hair-text", "Orange hair (text)")
 _register_attribute_endpoint("/api/blonde-hair-text", "Blonde hair (text)")
 
 
-@app.post("/api/image-edit")
+@api.post("/api/image-edit")
 async def api_image_edit(
     file: UploadFile = File(...),
     attribute: str = Form("Smile"),