3394be4ee9
When --oidc-issuer is set, validate tokens as RS256 id_tokens fetched against bincio-auth's JWKS endpoint (cached for 1h). Falls back to HS256 if the RS256 check fails, so existing sessions keep working during the transition. DB session lookup is the final fallback. New --oidc-issuer flag reads BINCIO_OIDC_ISSUER env var.