fix(apps): reconcile goldens to one canonical render + enforce render==golden gate

The committed apps/ goldens were a MIX of two render flag sets: 8 services
were rendered with `--no-image-automation` (no image CRs) while gitea and
nextcloud carried stale ImageRepository/ImagePolicy CRs from a render WITHOUT
the flag. Neither single command reproduced all goldens, and the gate did not
catch it.

Part A — canonical render:
  python3 catalog/render.py --all catalog -o apps --wave-layout --no-image-automation
`--no-image-automation` is canonical: image automation is authored-but-DISABLED
(DECISIONS-LOG; image-reflector/-automation controllers not installed), and
every app was onboarded via this flag. Re-render drops the ImageRepository +
ImagePolicy objects from gitea + nextcloud only (52 line deletions, purely the
trailing image-automation blocks). No functional content changed — the
nextcloud postStart hardening and gitea OIDC hook are untouched.

Part B — enforcement:
  ci/render-golden.sh renders every onboarded catalog service with the canonical
  command into a temp dir and FAILS on ANY diff vs committed apps/ (missing
  golden or content drift), across all 10 services (not just the 3 L1 spot-checks).
  Not-onboarded catalog entries (keycloak, vm-demo) are excluded per DESIGN-waves.
  Wired as a required no-cluster stage in ci/gate.sh, ci/Makefile, and both the
  live (.gitea/workflows/gate.yml) and dormant (merge-gate.yaml) pipelines.

Proof: tampering a golden makes the stage exit 1 (blocks merge); reverting
restores exit 0. `make -C ci gate` green in the devcontainer.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

apps/wave-0/gitea.yaml

@@ -255,29 +255,3 @@ spec:
       annotations:
         summary: gitea is down
         description: 'gitea has been unreachable for 5m (SLI: up).'
----
-# Flux ImageRepository (R-UPD)
-apiVersion: image.toolkit.fluxcd.io/v1beta2
-kind: ImageRepository
-metadata:
-  name: gitea
-  namespace: gitea
-spec:
-  image: gitea/gitea
-  interval: 1h0m0s
----
-# Flux ImagePolicy (R-UPD)
-apiVersion: image.toolkit.fluxcd.io/v1beta2
-kind: ImagePolicy
-metadata:
-  name: gitea
-  namespace: gitea
-  annotations:
-    homelab.keithjackson.dev/update-channel: stable
-    homelab.keithjackson.dev/auto-rollback: 'true'
-spec:
-  imageRepositoryRef:
-    name: gitea
-  policy:
-    semver:
-      range: '>=1.22.0 <2.0.0'