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/messages-frontend-theme-configmap.yaml

@@ -0,0 +1,50 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: messages-frontend-theme
+  namespace: lasuite
+data:
+  sunbeam-theme.css: |
+    /*
+     * O Estúdio — runtime brand overrides for messages-frontend.
+     * Loaded via <link href="/sunbeam-theme.css"> injected in _document.tsx.
+     * Override Cunningham v4 --c--globals--* variables (no rebuild for updates).
+     */
+    @import url('https://fonts.googleapis.com/css2?family=Ysabeau:ital,wght@0,100..900;1,100..900&display=swap');
+
+    :root {
+      --c--globals--font--families--base: 'Ysabeau Variable', Inter, sans-serif;
+      --c--globals--font--families--accent: 'Ysabeau Variable', Inter, sans-serif;
+
+      /* Brand — amber/gold palette */
+      --c--globals--colors--brand-050: #fffbeb;
+      --c--globals--colors--brand-100: #fef3c7;
+      --c--globals--colors--brand-150: #fde9a0;
+      --c--globals--colors--brand-200: #fde68a;
+      --c--globals--colors--brand-250: #fde047;
+      --c--globals--colors--brand-300: #fcd34d;
+      --c--globals--colors--brand-350: #fbcf3f;
+      --c--globals--colors--brand-400: #fbbf24;
+      --c--globals--colors--brand-450: #f8b31a;
+      --c--globals--colors--brand-500: #f59e0b;
+      --c--globals--colors--brand-550: #e8920a;
+      --c--globals--colors--brand-600: #d97706;
+      --c--globals--colors--brand-650: #c26d05;
+      --c--globals--colors--brand-700: #b45309;
+      --c--globals--colors--brand-750: #9a4508;
+      --c--globals--colors--brand-800: #92400e;
+      --c--globals--colors--brand-850: #7c370c;
+      --c--globals--colors--brand-900: #78350f;
+      --c--globals--colors--brand-950: #451a03;
+
+      /* Logo gradient */
+      --c--globals--colors--logo-1: #f59e0b;
+      --c--globals--colors--logo-2: #d97706;
+      --c--globals--colors--logo-1-light: #f59e0b;
+      --c--globals--colors--logo-2-light: #d97706;
+      --c--globals--colors--logo-1-dark: #fcd34d;
+      --c--globals--colors--logo-2-dark: #fbbf24;
+
+      /* PWA theme color */
+      --sunbeam-brand: #f59e0b;
+    }