complete reviews system (phases 4-6)

- review display: photos with lightbox, verified badge, pagination
- admin moderation: pending/approved/rejected tabs, bulk actions, nav badge
- SEO: JSON-LD AggregateRating and Review markup on product pages
- automation: review request emails 7 days after delivery (Oban worker)
- rating cache: avg/count fields on products, updated on approval
- fix file size validation in media test (10MB limit)

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

lib/berrypod_web/admin_layout_hook.ex

@@ -5,7 +5,7 @@ defmodule BerrypodWeb.AdminLayoutHook do
   """
   import Phoenix.Component
 
-  alias Berrypod.{ActivityLog, Settings}
+  alias Berrypod.{ActivityLog, Reviews, Settings}
   alias Berrypod.Theme.{CSSCache, CSSGenerator}
 
   def on_mount(:assign_current_path, _params, _session, socket) do
@@ -33,6 +33,7 @@ defmodule BerrypodWeb.AdminLayoutHook do
       |> assign(:site_description, Settings.site_description())
       |> assign(:generated_css, generated_css)
       |> assign(:attention_count, ActivityLog.count_needing_attention())
+      |> assign(:pending_review_count, Reviews.count_pending_reviews())
       |> Phoenix.LiveView.attach_hook(:set_current_path, :handle_params, fn _params,
                                                                             uri,
                                                                             socket ->