User Organization Images Create

Upload a new image asset to the organization. Request format (multipart/form-data): - image: Image file (required) - filename: Custom filename (optional, will generate UUID if not provided) Request format (JSON): - image_data: Base64 encoded image data (required) - filename: Custom filename (optional) - content_type: MIME type (optional, will guess from filename) Returns: - 201: Image uploaded successfully - 400: Invalid request or unsupported image format - 413: File too large - 500: Upload failed