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/service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: shannon-api
+  namespace: shannon
+spec:
+  selector:
+    app: shannon-api
+  ports:
+    - name: http
+      port: 3000
+      targetPort: 3000