fix(authentik): pin chart 2026.5.2, grant_types allowlist, portal redirect URI

- Pin the helm-controller chart version (unset = silent latest upgrades) and
  move the image tag under global.image per the 2026.5 chart layout.
- Authentik 2026.5 enforces a per-provider grant_types allowlist; empty list
  rejected every authorize request. Allow authorization_code + refresh_token
  for portal and operator providers.
- Fix the portal redirect URI to the nuxt-oidc-auth callback path.
- Serve the auth ingress on :80 with a per-router HTTPS redirect so the
  cert-manager HTTP-01 solver keeps working.

infrastructure/production/fleet/authentik/helmchart.yaml

@@ -1,6 +1,6 @@
 # Authentik via the k3s Helm controller. valuesContent mirrors values.yaml
-# (keep them in sync). Version intentionally unpinned for the first install —
-# PIN the resolved chart version here once it's up (see RUNBOOK.md).
+# (keep them in sync). valuesContent here is the LIVE source — values.yaml is
+# just a human-readable mirror, not consumed by helm-controller.
 #
 # The 'authentik-secret' Secret must exist in dezky-auth BEFORE this (it carries
 # AUTHENTIK_SECRET_KEY + the DB/Redis/bootstrap creds via global.envFrom).
@@ -12,12 +12,18 @@ metadata:
 spec:
   repo: https://charts.goauthentik.io
   chart: authentik
+  # Pinned: helm-controller reconciles on a loop and pulls the LATEST chart when
+  # version is unset — a successful reconcile would then silently upgrade
+  # authentik. Keep == the deployed version.
+  version: 2026.5.2
   targetNamespace: dezky-auth
   createNamespace: true
   valuesContent: |-
-    image:
-      tag: "2026.5.2"
     global:
+      # Image moved under global.image in chart 2026.5.x; the old top-level
+      # `image:` key now hard-fails the chart's deprecation guard (deprectations.yaml).
+      image:
+        tag: "2026.5.2"
       envFrom:
         - secretRef:
             name: authentik-secret
@@ -45,6 +51,11 @@ spec:
         ingressClassName: traefik
         annotations:
           cert-manager.io/cluster-issuer: letsencrypt-prod
+          # Serve on :80 too so the cert-manager ACME HTTP-01 solver can answer
+          # on port 80 at renewal; redirect-https bounces other traffic to HTTPS.
+          # (Middleware lives in authentik/redirect-middleware.yaml.)
+          traefik.ingress.kubernetes.io/router.entrypoints: web,websecure
+          traefik.ingress.kubernetes.io/router.middlewares: dezky-auth-redirect-https@kubernetescrd
         hosts:
           - auth.dezky.eu
         paths: