Get Inline Image

Get an inline image by streaming it from GCS.

This endpoint streams the image content directly from GCS. Requires read access to the deal.

Note: image_name may contain non-ASCII characters (e.g., macOS screenshot filenames contain U+202F “narrow no-break space”). Two encoding steps handle this:

1. GCS path: get_gcs_path() URL-encodes the filename for consistent storage/retrieval
2. HTTP header: Content-Disposition uses RFC 5987 encoding (filename*=UTF-8”)