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/controllers/seo_controller.ex

@@ -26,48 +26,66 @@ defmodule BerrypodWeb.SeoController do
 
   def sitemap(conn, _params) do
     base = BerrypodWeb.Endpoint.url()
-    products = Products.list_visible_products()
+    products = Products.list_products_for_sitemap()
     categories = Products.list_categories()
 
     static_pages = [
-      {R.home(), "daily", "1.0"},
-      {R.collection("all"), "daily", "0.9"},
-      {R.about(), "monthly", "0.5"},
-      {R.contact(), "monthly", "0.5"},
-      {R.delivery(), "monthly", "0.5"},
-      {R.privacy(), "monthly", "0.3"},
-      {R.terms(), "monthly", "0.3"}
+      {R.home(), "daily", "1.0", []},
+      {R.collection("all"), "daily", "0.9", []},
+      {R.about(), "monthly", "0.5", []},
+      {R.contact(), "monthly", "0.5", []},
+      {R.delivery(), "monthly", "0.5", []},
+      {R.privacy(), "monthly", "0.3", []},
+      {R.terms(), "monthly", "0.3", []}
     ]
 
     category_pages =
       Enum.map(categories, fn cat ->
-        {R.collection(cat.slug), "daily", "0.8"}
+        {R.collection(cat.slug), "daily", "0.8", []}
       end)
 
     product_pages =
       Enum.map(products, fn product ->
-        {R.product(product.slug), "weekly", "0.9"}
+        images = product_image_entries(product, base)
+        {R.product(product.slug), "weekly", "0.9", images}
       end)
 
     custom_pages =
       Pages.list_custom_pages()
       |> Enum.filter(& &1.published)
-      |> Enum.map(fn page -> {"/#{page.slug}", "weekly", "0.6"} end)
+      |> Enum.map(fn page -> {"/#{page.slug}", "weekly", "0.6", []} end)
 
     all_pages = static_pages ++ category_pages ++ product_pages ++ custom_pages
 
     entries =
-      Enum.map_join(all_pages, "\n", fn {path, changefreq, priority} ->
-        "  <url>\n" <>
-          "    <loc>#{base}#{path}</loc>\n" <>
-          "    <changefreq>#{changefreq}</changefreq>\n" <>
-          "    <priority>#{priority}</priority>\n" <>
-          "  </url>"
+      Enum.map_join(all_pages, "\n", fn {path, changefreq, priority, images} ->
+        image_tags =
+          Enum.map_join(images, "\n", fn img ->
+            """
+                <image:image>
+                  <image:loc>#{xml_escape(img.url)}</image:loc>
+                  <image:title>#{xml_escape(img.title)}</image:title>
+                </image:image>
+            """
+            |> String.trim_trailing()
+          end)
+
+        url_content =
+          "    <loc>#{xml_escape(base <> path)}</loc>\n" <>
+            "    <changefreq>#{changefreq}</changefreq>\n" <>
+            "    <priority>#{priority}</priority>"
+
+        if image_tags == "" do
+          "  <url>\n#{url_content}\n  </url>"
+        else
+          "  <url>\n#{url_content}\n#{image_tags}\n  </url>"
+        end
       end)
 
     xml = """
     <?xml version="1.0" encoding="UTF-8"?>
-    <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+    <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
+            xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     #{entries}
     </urlset>
     """
@@ -76,4 +94,27 @@ defmodule BerrypodWeb.SeoController do
     |> put_resp_content_type("application/xml")
     |> send_resp(200, xml)
   end
+
+  defp product_image_entries(product, base_url) do
+    product.images
+    |> Enum.take(5)
+    |> Enum.map(fn product_image ->
+      image = product_image.image
+      alt_text = product_image.alt_text || product.title
+      url = "#{base_url}/image_cache/#{image.id}.webp"
+
+      %{url: url, title: alt_text}
+    end)
+  end
+
+  defp xml_escape(nil), do: ""
+
+  defp xml_escape(text) when is_binary(text) do
+    text
+    |> String.replace("&", "&amp;")
+    |> String.replace("<", "&lt;")
+    |> String.replace(">", "&gt;")
+    |> String.replace("\"", "&quot;")
+    |> String.replace("'", "&apos;")
+  end
 end