A swarm service that has to tell hives apart needs the token itself to
say which hive presented it. Two client-registration fields were missing
for that, and both are properties of the client rather than of any one
consumer:
- `audience` registers which `aud` values a client may request. It is a
boundary, not a label: asking for one that is not registered is
refused with `invalid_target`, so a hive cannot mint a token for
another hive's slot.
- `accessTokenSignedResponseAlg` switches the access token from
authelia's default opaque handle to an RFC 9068 JWT, which is what
lets a resource server verify a token against `/jwks.json` instead of
asking authelia about every request.
Each hive's audience is its own client id rather than a new per-hive
string. The identity is the directory's, not the consumer's, and the id
is already published as `hiveClientPrefix` precisely so a second
consumer does not carry its own copy of the naming rule.
Both fields default to authelia's own behaviour, so no existing client
changes.
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