The collector's oidc/swarm authenticator verifies the bearer offline as a
JWT. The controller's authelia client was registered without
accessTokenSignedResponseAlg, so authelia mints it an opaque
authelia_at_ handle, which that authenticator cannot verify: by config,
no push from the vcs or jobq exporter can be accepted. Register it with
RS256 like every other client whose token lands on an oidc/* receiver.
The SDK logs a failed export at debug only, so a refused push never
reached the journal. AuthenticatedHttpClient now warns on a failed token
mint, a transport error, or a non-2xx answer (status plus a body
snippet), once per kind of failure and again every 10 minutes with a
count, and logs once when a push succeeds after failing.
Refs #5393
The three client registrations move into glue-{controller,nats,matrix}-oidc-client.nix,
gated only on deploy.authelia.enable and reading their ids from swarm.* options,
so the host running authelia registers every one of them whichever host runs
the service. The matrix callback is a new read-only swarm.matrix.sso.redirectUri,
read by both the homeserver's config and its client entry.
swarm-secret-publish now also publishes the queue's and the homeserver's minted
secrets to swarm/services/<id>/oidc/client. The queue host reads its responder's
secret there with swarm-bao-nats-auth-oidc under the responder's own leaf
(swarm-nats-auth role gains that one read path), and the homeserver's host with
swarm-bao-matrix-oidc under matrix-ctl's leaf (swarm-matrix-ctl role gains its
one read path). The host-file copies are gone: swarm-nats-auth-secrets now
delivers only the callout seeds and the store identity, and
hive-matrix-oidc-secret is removed. A fetch unit whose leaf is unset still
renders and fails naming the option pair.
Closes#4943
