add custom page LiveView with catch-all routing

Shop.CustomPage handles /:slug catch-all for CMS pages. Restructured
router so the catch-all is last — all admin, auth, setup, and SEO
routes defined before the shop scope to prevent interception.

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

lib/berrypod_web/live/shop/custom_page.ex

@@ -0,0 +1,80 @@
+defmodule BerrypodWeb.Shop.CustomPage do
+  use BerrypodWeb, :live_view
+
+  alias Berrypod.Pages
+
+  @impl true
+  def mount(_params, _session, socket) do
+    {:ok, socket}
+  end
+
+  @impl true
+  def handle_params(%{"slug" => slug}, _uri, socket) do
+    page = Pages.get_page(slug)
+
+    cond do
+      is_nil(page) ->
+        record_broken_url("/#{slug}")
+
+        {:noreply,
+         socket
+         |> put_flash(:error, "Page not found")
+         |> push_navigate(to: ~p"/")}
+
+      page.type != "custom" ->
+        {:noreply,
+         socket
+         |> put_flash(:error, "Page not found")
+         |> push_navigate(to: ~p"/")}
+
+      page.published != true and not socket.assigns.is_admin ->
+        {:noreply,
+         socket
+         |> put_flash(:error, "Page not found")
+         |> push_navigate(to: ~p"/")}
+
+      true ->
+        extra = Pages.load_block_data(page.blocks, socket.assigns)
+        base = BerrypodWeb.Endpoint.url()
+
+        socket =
+          socket
+          |> assign(:page_title, page.title)
+          |> assign(:page, page)
+          |> maybe_assign_meta(page, base)
+          |> assign(extra)
+
+        {:noreply, socket}
+    end
+  end
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <BerrypodWeb.PageRenderer.render_page {assigns} />
+    """
+  end
+
+  defp record_broken_url(path) do
+    prior_hits = Berrypod.Analytics.count_pageviews_for_path(path)
+    Berrypod.Redirects.record_broken_url(path, prior_hits)
+
+    if prior_hits > 0 do
+      Berrypod.Redirects.attempt_auto_resolve(path)
+    end
+  rescue
+    _ -> :ok
+  end
+
+  defp maybe_assign_meta(socket, page, base) do
+    socket
+    |> assign(:og_url, base <> "/#{page.slug}")
+    |> then(fn s ->
+      if page.meta_description do
+        assign(s, :page_description, page.meta_description)
+      else
+        s
+      end
+    end)
+  end
+end