Onboard watchstate into Authentik for oauth2-proxy

watchstate is an internal media watch-state sync admin tool deployed at
watchstate.k8s.syd1.au.unkin.net behind oauth2-proxy (OIDC against
Authentik). Add the OAuth2/OIDC provider + application mirroring the
logviewer/traefik in-cluster admin pattern, gate it with the
akP-watchstate-admin permission group bound to the app, and nest that
permission into the akR-global-admin role so only the admin team can
authorize.

config/permissions/akP-watchstate-admin.yaml

@@ -0,0 +1,3 @@
+# Permission group akP-watchstate-admin (name = filename). Grants admin
+# access to watchstate: bound to the watchstate application, gating the UI.
+application: watchstate

config/providers_oauth2/watchstate.yaml

@@ -0,0 +1,22 @@
+# OAuth2/OIDC provider + application for watchstate (the internal media
+# watch-state sync admin tool, served at
+# https://watchstate.k8s.syd1.au.unkin.net in the watchstate namespace). An
+# oauth2-proxy in front of the UI performs the OIDC login; access is gated on
+# the user's hierarchical ak_groups claim (akP-watchstate-admin).
+# client_secret is read from Vault (seeded out of band), never committed.
+name: watchstate
+authorization_flow: default-provider-authorization-implicit-consent
+invalidation_flow: default-provider-invalidation-flow
+client_type: confidential
+client_id: watchstate
+launch_url: https://watchstate.k8s.syd1.au.unkin.net/
+client_secret_vault:
+  mount: kv
+  path: kubernetes/namespace/watchstate/default/oauth-credentials
+scope_mappings:
+  - goauthentik.io/providers/oauth2/scope-openid
+  - goauthentik.io/providers/oauth2/scope-email
+  - goauthentik.io/providers/oauth2/scope-profile
+redirect_uris:
+  - matching_mode: strict
+    url: https://watchstate.k8s.syd1.au.unkin.net/oauth2/callback

config/roles/akR-global-admin.yaml

@@ -7,6 +7,7 @@ permissions:
   - akP-jellyfin-admin
   - akP-traefik-admin
   - akP-logviewer-admin
+  - akP-watchstate-admin
   # arrstack has no admin tier (it is a proxy front door); grant global admins
   # the front door plus every per-app entitlement so they reach all media apps.
   - akP-arrstack-user