add SEO enhancements: OG images, meta robots, FAQ block, image sitemap

- Per-page SEO controls: meta robots directives, focus keyword, OG image
- Site-wide default OG image in admin settings
- FAQ block type with FAQPage JSON-LD schema
- Enhanced Organization JSON-LD with business info, contact, address
- Image sitemap with product images
- SEO preview panel with Google/social card mockups
- SEO checklist with real-time scoring
- Business info section in site editor
- GSC integration scaffolding (OAuth, client, cache)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/berrypod_web/live/shop/pages/collection.ex

@@ -7,6 +7,7 @@ defmodule BerrypodWeb.Shop.Pages.Collection do
   import Phoenix.LiveView, only: [push_patch: 2, push_navigate: 2, put_flash: 3]
 
   alias Berrypod.{Pages, Pagination, Products}
+  alias BerrypodWeb.Helpers.SeoHelpers
   alias BerrypodWeb.R
 
   @sort_options [
@@ -20,16 +21,29 @@ defmodule BerrypodWeb.Shop.Pages.Collection do
 
   def init(socket, _params, _uri) do
     page = Pages.get_page("collection")
+    base = BerrypodWeb.Endpoint.url()
 
     socket =
       socket
       |> assign(:page, page)
       |> assign(:sort_options, @sort_options)
       |> assign(:current_sort, "featured")
+      |> maybe_assign_meta_robots(page)
+      |> SeoHelpers.assign_og_image(page, base)
 
     {:noreply, socket}
   end
 
+  defp maybe_assign_meta_robots(socket, page) do
+    meta_robots = page && page[:meta_robots]
+
+    if meta_robots && meta_robots != "index, follow" do
+      assign(socket, :meta_robots, meta_robots)
+    else
+      socket
+    end
+  end
+
   # When accessed via custom URL (e.g. /shop) without a collection slug, show all products
   def handle_params(params, uri, socket) when not is_map_key(params, "slug") do
     handle_params(Map.put(params, "slug", "all"), uri, socket)