Configure MCP servers to use Harbor OCI registry

- Updated Chart.yaml dependencies to use OCI registry
- Added HelmRepository resource for Harbor
- Created Harbor registry secret (SOPS-encrypted)
- Updated HelmRelease to use HelmRepository instead of Git source
- Packaged and pushed all 16 MCP charts to Harbor OCI registry
- Updated .sops.yaml to handle platform secrets

All MCP charts are now available at:
oci://images.caffeinetux.com/mcp-charts

platform/mcp-servers/kustomization.yaml

@@ -1,11 +1,11 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
-namespace: mcp
-
 resources:
   - namespace.yaml
   - secrets.enc.yaml
+  - harbor-secret.enc.yaml
+  - helmrepository.yaml
   - helmrelease.yaml
 
 # SOPS decryption for encrypted secrets