Rename ecosplay client, fix redirect URIs, set admin user real name

- Rename OIDC client ecosplay-web -> ecosplay_web in the realm import
  JSON. The client is used by the internal e-cosplay site for OAuth.
- Replace wildcard redirect URIs with the two exact callbacks:
  https://www.e-cosplay.fr/oauth/keycloak and
  https://cos.local/oauth/keycloak. webOrigins and post-logout URIs
  follow the same hosts.
- Add helpers to sync.sh (client_internal_id, rename_client,
  set_client_uris) and a reconciliation step that renames any legacy
  ecosplay-web -> ecosplay_web and idempotently re-applies the URIs
  on every run, so live installs are migrated automatically.
- Set the bootstrap admin user's real first/last name (jovann Serreau)
  in both the env vars and the realm import JSON.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -71,8 +71,8 @@ services:
       ECOSPLAY_GROUPS: "gp_asso gp_contest gp_mail gp_mailling gp_member gp_ndd gp_sign gp_ticket super_admin_asso superadmin"
       ADMIN_USER_USERNAME: jovann@siteconseil.fr
       ADMIN_USER_PASSWORD: Shoko1997@
-      ADMIN_USER_FIRSTNAME: Jovann
-      ADMIN_USER_LASTNAME: SiteConseil
+      ADMIN_USER_FIRSTNAME: jovann
+      ADMIN_USER_LASTNAME: Serreau
     volumes:
       - ./init/sync.sh:/opt/init/sync.sh:ro
     entrypoint: ["/bin/bash", "/opt/init/sync.sh"]