feat: La Suite email/messages, buildkitd, monitoring, vault and storage updates

- Add Messages (email) service: backend, frontend, MTA in/out, MPA, SOCKS
  proxy, worker, DKIM config, and theme customization
- Add Collabora deployment for document collaboration
- Add Drive frontend nginx config and values
- Add buildkitd namespace for in-cluster container builds
- Add SeaweedFS remote sync and additional S3 buckets
- Update vault secrets across namespaces (devtools, lasuite, media,
  monitoring, ory, storage) with expanded credential management
- Update monitoring: rename grafana→metrics OAuth2Client, add Prometheus
  remote write and additional scrape configs
- Update local/production overlays with resource patches
- Remove stale login-ui resource patch from production overlay

base/lasuite/docs-values.yaml

@@ -155,6 +155,7 @@ backend:
             height: "auto"
           alt: ""
           withTitle: true
+      css_url: "https://integration.DOMAIN_SUFFIX/api/v2/theme.css"
       waffle:
         apiUrl: "https://integration.DOMAIN_SUFFIX/api/v2/services.json"
         widgetPath: "https://integration.DOMAIN_SUFFIX/api/v2/lagaufre.js"