feat: added doc rendering

lib/bds/help_docs.ex

@@ -0,0 +1,54 @@
+defmodule BDS.HelpDocs do
+  @moduledoc false
+
+  alias BDS.Scripting.ApiDocs
+  use Gettext, backend: BDS.Gettext
+
+  @documentation_path Path.expand("../../DOCUMENTATION.md", __DIR__)
+
+  @type help_kind :: :documentation | :api_documentation
+
+  @spec fetch(help_kind()) :: %{title: String.t(), subtitle: String.t(), markdown: String.t()}
+  def fetch(:documentation) do
+    %{
+      title: dgettext("ui", "Documentation"),
+      subtitle:
+        dgettext(
+          "ui",
+          "End-user guidance for editorial workflows, media, templates, translation, and publishing in bDS2."
+        ),
+      markdown: documentation_markdown()
+    }
+  end
+
+  def fetch(:api_documentation) do
+    %{
+      title: dgettext("ui", "API"),
+      subtitle:
+        dgettext(
+          "ui",
+          "Current Lua scripting contract rendered from the live bDS2 runtime."
+        ),
+      markdown: ApiDocs.render()
+    }
+  end
+
+  @spec documentation_markdown() :: String.t()
+  def documentation_markdown do
+    case File.read(@documentation_path) do
+      {:ok, contents} -> contents
+      {:error, _reason} -> fallback_documentation()
+    end
+  end
+
+  defp fallback_documentation do
+    [
+      "# bDS2 User Guide",
+      "",
+      "The project-level DOCUMENTATION.md file is missing.",
+      "",
+      "Use the repository root documentation file to provide the in-app user guide."
+    ]
+    |> Enum.join("\n")
+  end
+end