add newsletter and email campaigns

Subscribers with double opt-in confirmation, campaign composer with
draft/scheduled/sent lifecycle, admin dashboard with overview stats,
CSV export, and shop signup form wired into page builder blocks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/router.ex

@@ -136,6 +136,7 @@ defmodule BerrypodWeb.Router do
     pipe_through [:browser, :require_authenticated_user, :admin]
 
     get "/analytics/export", AnalyticsExportController, :export
+    get "/newsletter/export", NewsletterExportController, :export
 
     live_session :admin,
       layout: {BerrypodWeb.Layouts, :admin},
@@ -160,6 +161,9 @@ defmodule BerrypodWeb.Router do
       live "/pages/:slug", Admin.Pages.Editor, :edit
       live "/navigation", Admin.Navigation, :index
       live "/media", Admin.Media, :index
+      live "/newsletter", Admin.Newsletter, :index
+      live "/newsletter/campaigns/new", Admin.Newsletter.CampaignForm, :new
+      live "/newsletter/campaigns/:id", Admin.Newsletter.CampaignForm, :edit
       live "/redirects", Admin.Redirects, :index
     end
 
@@ -203,6 +207,7 @@ defmodule BerrypodWeb.Router do
 
     get "/orders/verify/:token", OrderLookupController, :verify
     get "/unsubscribe/:token", UnsubscribeController, :unsubscribe
+    get "/newsletter/confirm/:token", NewsletterController, :confirm
   end
 
   # Dev-only routes (mailbox preview, error previews)
@@ -247,7 +252,8 @@ defmodule BerrypodWeb.Router do
         {BerrypodWeb.CartHook, :mount_cart},
         {BerrypodWeb.SearchHook, :mount_search},
         {BerrypodWeb.AnalyticsHook, :track},
-        {BerrypodWeb.PageEditorHook, :mount_page_editor}
+        {BerrypodWeb.PageEditorHook, :mount_page_editor},
+        {BerrypodWeb.NewsletterHook, :mount_newsletter}
       ] do
       live "/", Shop.Home, :index
       live "/about", Shop.Content, :about
@@ -274,6 +280,9 @@ defmodule BerrypodWeb.Router do
     post "/contact/send", ContactController, :create
     post "/contact/lookup", OrderLookupController, :lookup
 
+    # Newsletter signup (no-JS fallback)
+    post "/newsletter/subscribe", NewsletterController, :subscribe
+
     # Cart form actions (no-JS fallbacks for LiveView cart events)
     post "/cart/add", CartController, :add
     post "/cart/remove", CartController, :remove