feat: keycloak internal server URL

[MasterCarl]

This PR adds a new configuration option serverUrlInternal to the Keycloak provider.

• If set, serverUrlInternal is used instead of serverUrl to request the access token from the Keycloak server: ${config.serverUrlInternal || config.serverUrl}/realms/${config.realm}
• Meanwhile, the client redirect keeps using serverUrl: ${config.serverUrl}/realms/${config.realm}

Use case

In our end-to-end tests, both Keycloak and Nuxt run in Docker via docker compose. Nuxt accesses Keycloak via http://keycloak:8080. However, the browser runs outside of Docker and talks to both services via localhost URLs.
The new configuration option simplifies the setup by allowing the browser to be redirected to http://localhost:8080, while the token is retrieved from http://keycloak:8080.

[pkg-pr-new]

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npm i https://pkg.pr.new/atinux/nuxt-auth-utils@304

commit: 7a54c10