Use OpenWebUI image model compatibility alias

compose.yaml

@@ -525,7 +525,10 @@ services:
       # previously active Qwen profile after every image.
       ENABLE_IMAGE_GENERATION: "true"
       IMAGE_GENERATION_ENGINE: openai
-      IMAGE_GENERATION_MODEL: flux
+      # OpenWebUI v0.9.x exposes a fixed OpenAI image-model dropdown. The
+      # router accepts this compatibility alias and still executes local
+      # FLUX.2 Klein; no request is sent to OpenAI.
+      IMAGE_GENERATION_MODEL: gpt-image-1
       IMAGES_OPENAI_API_BASE_URL: http://router:8081/v1
       IMAGES_OPENAI_API_KEY: "${ROUTER_API_KEY:?ROUTER_API_KEY is required}"
       IMAGE_SIZE: 1024x1024