Implement base64 fallback for image handling when no uploader is configured (#1)

* Initial plan

* Implement base64 fallback for image handling when no uploader configured

Co-authored-by: bbbugg <80089841+bbbugg@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: bbbugg <80089841+bbbugg@users.noreply.github.com>

app/service/image/image_create_service.py

@@ -10,6 +10,7 @@ from app.core.constants import VALID_IMAGE_RATIOS
 from app.domain.openai_models import ImageGenerationRequest
 from app.log.logger import get_image_create_logger
 from app.utils.uploader import ImageUploaderFactory
+from app.utils.helpers import is_image_upload_configured
 
 logger = get_image_create_logger()
 
@@ -97,12 +98,15 @@ class ImageCreateService:
                 image_data = generated_image.image.image_bytes
                 image_uploader = None
 
-                if request.response_format == "b64_json":
+                # Return base64 if explicitly requested or if no uploader is configured
+                if request.response_format == "b64_json" or not is_image_upload_configured():
                     base64_image = base64.b64encode(image_data).decode("utf-8")
                     images_data.append(
                         {"b64_json": base64_image, "revised_prompt": request.prompt}
                     )
+                    continue
                 else:
+                    # Upload to configured provider
                     current_date = time.strftime("%Y/%m/%d")
                     filename = f"{current_date}/{uuid.uuid4().hex[:8]}.png"