Initial listmonk role: eom.dev newsletter on Kubernetes

listmonk v6.2.0 with PostgreSQL 17, Dex login for listed admins,
delivery through postfix.eom.dev, Catppuccin public pages, Altcha
captcha and a double opt-in "eom.dev" list. Database-held settings
are converged by an idempotent SQL script, tested against v6.2.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

files/admin.css

@@ -0,0 +1,9 @@
+/* eom.dev: Catppuccin accent in the admin UI, light theme kept for readability. */
+:root {
+  --primary: #8839ef;
+  --link: #8839ef;
+}
+.navbar.is-dark, .navbar { border-bottom: 3px solid #8839ef; }
+.button.is-primary, .tag.is-primary { background-color: #8839ef; }
+.button.is-primary:hover { background-color: #7287fd; }
+a { color: #8839ef; }