feat: migrate to artifactapi 3+

What changed:
- Adds new v3 API and UI deployments (separate api-deployment.yaml, ui-deployment.yaml) alongside the existing monolithic artifactapi-deployment.yaml
- Adds CNPG PostgreSQL cluster + pooler to replace the standalone postgres deployment
- Adds new api-env configmap, new Vault secrets (postgres-credentials, environment), and a second VaultAuth (default1)
- Adds new services targeting the split api and ui selectors
- Adds HPAs for both new deployments
- Updates kustomization to include all new resources

argocd/applicationsets/platform.yaml

@@ -11,6 +11,7 @@ spec:
       revision: HEAD
       directories:
       - path: apps/overlays/*/artifactapi
+      - path: apps/overlays/*/artifactapi3
       - path: apps/overlays/*/cattle-system
       - path: apps/overlays/*/cert-manager
       - path: apps/overlays/*/certificates

argocd/projects/platform.yaml

@@ -17,6 +17,8 @@ spec:
       server: https://kubernetes.default.svc
     - namespace: 'artifactapi'
       server: https://kubernetes.default.svc
+    - namespace: 'artifactapi3'
+      server: https://kubernetes.default.svc
     - namespace: 'cert-manager'
       server: https://kubernetes.default.svc
     - namespace: 'certificates'