swarm options: no swarm.* value depends on a deploy option or this host's hive

- swarm.serviceDomains lists every swarm service name on every host. The
  store's issuing role is built from it, so the store now admits a leaf
  for grafana, metrics, otel, logs, the bao UI and the apex whichever host
  runs the store. Each gateway's own leaf stays narrowed by
  localServiceDomains.
- swarm.matrix.apiUrl defaults to http://<swarm.matrix.gatewayHost>
  (null when gatewayHost is null) instead of loopback on the matrix host.
- The authelia vhost proxies /bridge/ to swarm-authelia-bridge with the
  prefix stripped, and deploy.swarm-controller.authBridgeUrl defaults to
  ${swarm.authelia.url}/bridge on every host. swarm.authelia.bridgeUrl is
  removed.
- swarm-authelia-bridge admits only swarm-controller's OIDC client on
  every request (403 for any other active token), configured by
  SWARM_AUTHELIA_BRIDGE_CONTROLLER_CLIENT_ID (renamed from
  ..._OPERATOR_READER_CLIENT_ID, which gated ListOperators alone).
- swarm.peerHives is removed; swarm-wireguard.nix filters this host's own
  hive out of swarm.hives itself.

Closes #4933

docs/swarm/sso.md

@@ -249,9 +249,10 @@ HTML instead of the failure that actually happened:
 - `/api/oidc/token`, `/.well-known/openid-configuration` — a client
   parsing an error page as its JSON document
 
-The gateway routes authelia's `/api/` and `/.well-known/` prefixes
-**without** error interception. The split is by _audience_, not by an enumerated path
-list: a human gets the page, every machine caller gets the status.
+The gateway routes authelia's `/api/` and `/.well-known/` prefixes, and
+the bridge's `/bridge/`, **without** error interception. The split is by
+_audience_, not by an enumerated path list: a human gets the page, every
+machine caller gets the status.
 Enumerating endpoints individually would leave the next one added
 silently intercepted.