Harbor denies access to the V2 _catalog endpoint for robot accounts
(scope registry:catalog:* returns an empty JWT). This adds automatic
Harbor detection and falls back to the native Harbor project API
(/api/v2.0/projects/{name}/repositories) for both catalog listing
and image search.
- Detect Harbor via WWW-Authenticate header + /api/v2.0/ping (cached 5min)
- List repositories through Harbor project API with pagination
- Search repositories using Harbor's q=name=~ filter
- Transparent fallback: no configuration change required
Fixes#360
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jarek