fix(platform): controllers/configs split so CRDs precede their CRs

Un-suspend deadlocked: the single platform Kustomization applies HelmReleases
(which register CRDs) AND custom resources of those CRDs (ClusterIssuer,
Certificate, Kyverno ClusterPolicies) in ONE pass. Flux's server-side apply
fails atomically ('no matches for kind ClusterIssuer') → nothing installs, so
the CRD-registering HelmReleases never run either. Classic ordering deadlock.

Fix (flux2 controllers/configs pattern, applies to dev+prod equally — no
R-ENV-02 divergence): add a platform-config Flux Kustomization (dependsOn
platform, wait) carrying the CRs; platform keeps only the controllers.
- New clusters/base/platform-config.yaml (path ./platform-config, substituteFrom
  cluster-vars, no decryption — no SOPS content); wired into base + apps now
  dependsOn platform-config (transitively waits for platform).
- platform-config/ references the CR files IN PLACE via ../platform/... (Flux
  builds LoadRestrictionsNone; Kyverno policies must stay under platform/kyverno/
  for the CI L0  gate). CR resources dropped from the platform
  component kustomizations (cert-manager, gateway, kyverno).
- Authored the missing Cilium L2 resources (were only a TODO): CiliumLoadBalancerIPPool
  (dev NAT 10.73.0.240-.250) + CiliumL2AnnouncementPolicy (ens*), so Gateway
  LoadBalancer listeners get a VIP. Prod range must be parameterized later.

Verified: platform build has zero CRs; platform-config build has 2 ClusterIssuers,
6 ClusterPolicies, Certificate, Gateway, both Cilium L2 CRs; dev/prod build; gate PASS.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

clusters/base/apps.yaml

@@ -12,9 +12,10 @@ spec:
   timeout: 5m
   prune: true
   wait: true
-  # Ordering: platform (CNI, storage, TLS, DNS, gateway, identity) must be healthy first.
+  # Ordering: the full platform (controllers + their configs) must be healthy first.
+  # platform-config dependsOn platform, so depending on platform-config transitively waits for both.
   dependsOn:
-    - name: platform
+    - name: platform-config
   sourceRef:
     kind: GitRepository
     name: flux-system