feat(infra): add all Kubernetes manifests

- namespace, temporal server, workspaces PVC
- API server deployment, service, serviceaccount, RBAC
- Dev overlay

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/infra/base/kustomization.yaml

@@ -0,0 +1,7 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - deployment.yaml
+  - service.yaml
+  - serviceaccount.yaml
+  - rbac.yaml