## Why
WatchState currently only has an internal front door (watchstate.k8s.syd1.au.unkin.net, PR #419, merged). This adds a public front door at **watchstate.unkin.net** via the external (DMZ) Traefik so the admin UI is reachable off-cluster, still fully gated by oauth2-proxy/Authentik. The internal gateway and routes are untouched; oauth2-proxy now fronts BOTH hostnames.
Stacked base note: the intended base (benvin/watchstate-deploy, PR #419) merged into main before this PR opened, so this targets `main`.
## How
- **DNS**: `watchstate-dns-internal` DNSRecord in `apps/base/bind-internal/authoritative/records.yaml` (unkin.net zone, bind-internal) -> `A 198.18.199.0`, the traefik-external VIP. Mirrors the `arrstack-dns-internal` precedent (external front door via bind, not external-dns). Kept in the central bind-internal location, so no AppProject destination widening is needed.
- **Gateway**: new `watchstate-external` Gateway (`gatewayClassName: traefik-external`), http + https listeners on hostname `watchstate.unkin.net`. TLS terminated with the Let's Encrypt `*.unkin.net` wildcard secret `wildcard-unkin-net-tls` — so **no cert-manager and no external-dns annotations**.
- **Routes**: `watchstate-external-http-redirect` (http->https 301) and `watchstate-external` (https -> `watchstate-oauth2:80`), mirroring the arrproxy/cheeztv external patterns.
- **oauth2-proxy dual-host**: `OAUTH2_PROXY_REDIRECT_URL` changed from the pinned cluster callback to the **relative** `/oauth2/callback`. With `OAUTH2_PROXY_REVERSE_PROXY=true` (already set), oauth2-proxy derives scheme+host per request from `X-Forwarded-Proto/Host` (verified in oauth2-proxy v7.15.3 `getOAuthRedirectURI`: host-less redirectURL falls through to request-derived), so the callback works on both `watchstate.unkin.net` and `watchstate.k8s.syd1.au.unkin.net`. `COOKIE_DOMAINS` and `WHITELIST_DOMAINS` now list both hosts (one cookie per host; a single parent-domain cookie can't cleanly span unkin.net vs k8s.syd1.au.unkin.net).
- Dropped the no-op `argocd.argoproj.io/sync-wave: "0"` annotation on the `default` VaultAuth. New resources intentionally carry no sync-wave annotations.
## Validation
- `kustomize build --enable-helm` on `apps/overlays/au-syd1/watchstate` and `.../bind-internal`: OK.
- kubeconform (repo CI config, k8s 1.33.7): watchstate overlay 15/15 valid (2 Gateways, 4 HTTPRoutes); bind-internal overlay 67/67 valid (incl. `watchstate-dns-internal`).
## Dependencies
- **Reflector allow-list (argocd-apps PR #418)**: reflects `wildcard-unkin-net-tls` into the `watchstate` namespace. This PR references that secret as if present.
- **Authentik (terraform-authentik, separate PR)**: register both `https://watchstate.unkin.net/oauth2/callback` and `https://watchstate.k8s.syd1.au.unkin.net/oauth2/callback` as redirect URIs on the watchstate provider.
Reviewed-on: #420
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
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