refactor(forte-drop): remove standalone subdomain cert+route

The forteapp chart now supports tls.additionalDomains (multi-SAN) and
ingress.priority (forte-helm#10), so the per-slug wildcard cert and the
low-priority HostRegexp IngressRoute no longer need to be standalone
overlay resources. Routing + cert move to the forte-drop release values
(helm-prod-values). The issuer dnsZones change stays here.

Depends on forte-helm#10 (ingress.priority) merged + synced before the
values flip, else the consolidated HostRegexp would outrank and steal
mcp.drop.forteapps.net.

Refs #22

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/overlays/upc-dev/forte-drop/forte-drop-subdomains-ingressroute.yaml

@@ -1,39 +0,0 @@
-# Wildcard routing for per-slug forte drops: <slug>.drop.forteapps.net -> the forte-drop
-# web pod. The forteapp chart only emits a single exact Host(`drop.forteapps.net`) route
-# (the apex: admin + /api + public /shared drops), so this ADDITIVE IngressRoute adds the
-# wildcard. Kept in launchpad (forte-drop-specific) rather than the shared forteapp chart.
-#
-# It targets the SAME service the chart's route does — forte-drop-app:3000 — whose
-# targetPort is the auth sidecar (service.yaml: targetPort = auth.sidecarPort when auth is
-# on). So wildcard subdomains flow service:3000 -> sidecar -> app, i.e. they are Forte-login
-# gated exactly like the admin root. A forteOnly drop is therefore never served un-gated.
-#
-# priority: 1 (intentionally LOW). Traefik orders routers by rule-length by default, and the
-# regex string is longer than Host(`mcp.drop.forteapps.net`); without an explicit low
-# priority this regex would OUTRANK and STEAL mcp.drop.forteapps.net (and the apex) into the
-# web pod. priority:1 guarantees the exact Host() routers (mcp release, chart apex) always win;
-# only real per-slug subdomains fall through to here. The app's reserved-slug check
-# (mcp/www/api/admin/app) is a second line of defence.
-apiVersion: traefik.io/v1alpha1
-kind: IngressRoute
-metadata:
-  name: forte-drop-subdomains
-  namespace: forte-drop
-  labels:
-    app.kubernetes.io/name: forte-drop
-    app.kubernetes.io/part-of: apps
-    app.kubernetes.io/managed-by: argocd
-spec:
-  entryPoints:
-    - websecure
-  routes:
-    # Traefik v3 (chart 28.x) HostRegexp takes a Go RE2 pattern. Verify the rendered
-    # router against mcp./www./app./apex/<real-slug> before relying on it in prod.
-    - match: HostRegexp(`^[a-z0-9-]+\.drop\.forteapps\.net$`)
-      kind: Rule
-      priority: 1
-      services:
-        - name: forte-drop-app
-          port: 3000
-  tls:
-    secretName: wildcard-drop-forteapps-net-tls

apps/overlays/upc-dev/forte-drop/kustomization.yaml

@@ -5,5 +5,3 @@ resources:
 - keycloak-client-forte-drop.yaml
 - forte-drop-pdb.yaml
 - forte-drop-secrets-sealed.yaml
-- wildcard-drop-tls-certificate.yaml
-- forte-drop-subdomains-ingressroute.yaml

apps/overlays/upc-dev/forte-drop/wildcard-drop-tls-certificate.yaml

@@ -1,35 +0,0 @@
----
-# Wildcard TLS cert for the per-slug drop subdomains: <slug>.drop.forteapps.net.
-# forte_drop serves forte-login drops on their own subdomain (gated by the auth
-# sidecar), so each drop needs a valid cert for *.drop.forteapps.net — a name the
-# existing *.forteapps.net wildcard CANNOT cover (TLS wildcards match one label only).
-#
-# Scope: this cert covers ONLY *.drop.forteapps.net. The apex drop.forteapps.net is
-# NOT included here — it is served by the forteapp chart's own Certificate (secret
-# forte-drop-tls, dnsNames: [drop.forteapps.net]) and/or the existing *.forteapps.net
-# wildcard, so adding it here would be redundant.
-#
-# Issued DIRECTLY into the forte-drop namespace (not via the chart) so the app's
-# Traefik IngressRoute — which must reference a TLS secret in its OWN namespace — can
-# use it without cross-namespace cloning. This is the single issuer of secret
-# wildcard-drop-forteapps-net-tls; the forte-drop-subdomains IngressRoute references
-# that secret. The letsencrypt-prod dns01 solver is authorized for this name via its
-# selector.dnsZones (forteapps.net).
-apiVersion: cert-manager.io/v1
-kind: Certificate
-metadata:
-  name: wildcard-drop-forteapps-net
-  namespace: forte-drop
-spec:
-  secretName: wildcard-drop-forteapps-net-tls
-  issuerRef:
-    name: letsencrypt-prod
-    kind: ClusterIssuer
-  dnsNames:
-  - '*.drop.forteapps.net' # per-slug forte drop subdomains
-  duration: 2160h0m0s # 90 days
-  renewBefore: 720h0m0s # renew 30 days before expiry
-  privateKey:
-    algorithm: RSA
-    encoding: PKCS1
-    size: 4096