- Enabled `directAccessGrants` for `frontend-client` in `meldestelle-realm.json` to support ROPC login flow.
- Strengthened admin credentials in realm configuration to meet password policy requirements.
- Upgraded Keycloak to `26.5.5` with updated Docker healthcheck logic:
- Replaced `curl` with bash `/dev/tcp` for compatibility with `ubi9-micro` image.
- Switched health endpoint from `/ready` to `/live` for single-node use.
- Adjusted healthcheck timings (`start_period`, `timeout`, `interval`) for smoother startup.
- Removed deprecated v1 hostname parameter `KC_HOSTNAME_STRICT_HTTPS`.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>