Initial commit: homelab dashboard

Elixir + Phoenix dashboard displaying public and internal homelab
services. Internal services are shown only when the request originates
from the local network, detected server-side via conn.remote_ip with
Traefik trusted as a proxy (RemoteIp plug).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/homelab_dashboard_web/controllers/page_html.ex

@@ -0,0 +1,10 @@
+defmodule HomelabDashboardWeb.PageHTML do
+  @moduledoc """
+  This module contains pages rendered by PageController.
+
+  See the `page_html` directory for all templates available.
+  """
+  use HomelabDashboardWeb, :html
+
+  embed_templates "page_html/*"
+end