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/components/seo_checklist.ex

@@ -0,0 +1,50 @@
+defmodule BerrypodWeb.Components.SeoChecklist do
+  @moduledoc """
+  SEO checklist component showing focus keyword analysis results.
+
+  Displays a score and list of checks with pass/fail/warning status.
+  """
+
+  use Phoenix.Component
+
+  import BerrypodWeb.CoreComponents, only: [icon: 1]
+
+  alias Berrypod.SEO.Analyser
+
+  @doc """
+  Renders the SEO checklist with score and checks.
+  """
+  attr :page, :map, required: true
+
+  def seo_checklist(assigns) do
+    checks = Analyser.analyse(assigns.page)
+    score = Analyser.score(checks)
+    level = Analyser.score_level(score)
+
+    assigns =
+      assigns
+      |> assign(:checks, checks)
+      |> assign(:score, score)
+      |> assign(:level, level)
+
+    ~H"""
+    <div class="seo-checklist">
+      <div class="seo-score" data-level={@level}>
+        <span class="seo-score-value">{@score}%</span>
+        <span class="seo-score-label">SEO score</span>
+      </div>
+      <ul class="seo-checks">
+        <li :for={check <- @checks} class="seo-check" data-status={check.status}>
+          <.icon name={status_icon(check.status)} class="size-4 seo-check-icon" />
+          <span class="seo-check-label">{check.label}</span>
+          <span class="seo-check-hint">{check.message}</span>
+        </li>
+      </ul>
+    </div>
+    """
+  end
+
+  defp status_icon(:pass), do: "hero-check-circle"
+  defp status_icon(:fail), do: "hero-x-circle"
+  defp status_icon(:warning), do: "hero-exclamation-triangle"
+end