feat(garage,authentik): console multi-domain + standalone proxy outpost

Two related additions for gating a cross-host service (garage WebUI on a
storage host) behind authentik without breaking on TLS or X-Forwarded-Host:

garage role:
- Add garage_webui_domains (list), mirroring garage_s3_domains. The
  console router now accepts every entry, so a DMZ reverseproxy can use a
  backend_host whose cert SAN matches an internal *.int.* name instead of
  connecting by IP (which fails acme cert verification). Defaults to the
  single garage_webui_domain so existing inventories are unaffected.

authentik_outpost_proxy role (new):
- Standalone proxy (ForwardAuth) outpost, modelled on authentik_outpost_ldap.
  Co-locate it with the protected service so the ForwardAuth subrequest
  reaches authentik over the local docker network. The embedded outpost
  only works for services on the authentik host: a cross-host subrequest
  routed through an extra reverse-proxy hop arrives with a polluted
  X-Forwarded-Host (port/comma-appended), which the outpost no longer
  matches against the provider's external_host (404).

roles/authentik_outpost_proxy/meta/main.yml

@@ -0,0 +1,28 @@
+#SPDX-License-Identifier: MIT-0
+galaxy_info:
+  author: digitalboard
+  description: Deploy an authentik proxy (ForwardAuth) outpost via Docker Compose, co-located with the services it protects
+  company: Digitalboard
+  license: MIT-0
+
+  min_ansible_version: "2.14"
+
+  platforms:
+    - name: Debian
+      versions:
+        - bookworm
+    - name: Ubuntu
+      versions:
+        - jammy
+        - noble
+
+  galaxy_tags:
+    - authentik
+    - proxy
+    - forwardauth
+    - outpost
+    - sso
+    - docker
+    - digitalboard
+
+dependencies: []