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>

test/homelab_dashboard_web/controllers/error_html_test.exs

@@ -0,0 +1,14 @@
+defmodule HomelabDashboardWeb.ErrorHTMLTest do
+  use HomelabDashboardWeb.ConnCase, async: true
+
+  # Bring render_to_string/4 for testing custom views
+  import Phoenix.Template, only: [render_to_string: 4]
+
+  test "renders 404.html" do
+    assert render_to_string(HomelabDashboardWeb.ErrorHTML, "404", "html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(HomelabDashboardWeb.ErrorHTML, "500", "html", []) == "Internal Server Error"
+  end
+end

test/homelab_dashboard_web/controllers/error_json_test.exs

@@ -0,0 +1,12 @@
+defmodule HomelabDashboardWeb.ErrorJSONTest do
+  use HomelabDashboardWeb.ConnCase, async: true
+
+  test "renders 404" do
+    assert HomelabDashboardWeb.ErrorJSON.render("404.json", %{}) == %{errors: %{detail: "Not Found"}}
+  end
+
+  test "renders 500" do
+    assert HomelabDashboardWeb.ErrorJSON.render("500.json", %{}) ==
+             %{errors: %{detail: "Internal Server Error"}}
+  end
+end

test/homelab_dashboard_web/controllers/page_controller_test.exs

@@ -0,0 +1,8 @@
+defmodule HomelabDashboardWeb.PageControllerTest do
+  use HomelabDashboardWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, ~p"/")
+    assert html_response(conn, 200) =~ "Peace of mind from prototype to production"
+  end
+end