Mealie requires OIDC_CLIENT_SECRET even though its docs say "public
client with PKCE". The token exchange happens server-side in Mealie's
Python backend, so the secret never reaches the browser.
- Generate client secret, store in 1Password
- Add to Authentik external-secret and worker env
- Switch blueprint from public to confidential
- Add ExternalSecret for mealie namespace
- Update docs to reflect confidential client
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>