WorkspaceAuth only accepted bearer tokens, blocking the canvas from
calling per-workspace routes (restart, config, secrets, chat) on the
tenant image where canvas + API share the same origin.
Added isSameOriginCanvas() fallback (same check used by AdminAuth):
checks Referer matches request Host, gated behind CANVAS_PROXY_URL
so only tenant deployments are affected.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
807b4c1b45