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/router.ex

@@ -177,6 +177,7 @@ defmodule BerrypodWeb.Router do
       live "/pages/:slug/settings", Admin.Pages.CustomForm, :edit
       live "/pages/:slug", Admin.Pages.Editor, :edit
       live "/media", Admin.Media, :index
+      live "/reviews", Admin.Reviews, :index
       live "/newsletter", Admin.Newsletter, :index
       live "/newsletter/campaigns/new", Admin.Newsletter.CampaignForm, :new
       live "/newsletter/campaigns/:id", Admin.Newsletter.CampaignForm, :edit