Add shop, POS sync, event ticketing, and shipping catalog apps.

Clients can run in-house retail without Shopify while keeping the same
Docker/Django/Postgres stack and data-ownership promise. Closes #5.

site/dashboard/templates/dashboard/home.html

@@ -27,6 +27,28 @@
     <div class="value">{{ open_invoices|default:0 }}</div>
   </div>
   {% endif %}
+  {% if 'shop' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Open shop orders</div>
+    <div class="value">{{ open_shop_orders|default:0 }}</div>
+  </div>
+  <div class="stat-card">
+    <div class="label">Low stock</div>
+    <div class="value">{{ low_stock_products|default:0 }}</div>
+  </div>
+  {% endif %}
+  {% if 'events' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Upcoming events</div>
+    <div class="value">{{ upcoming_events|default:0 }}</div>
+  </div>
+  {% endif %}
+  {% if 'shipping' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Unshipped orders</div>
+    <div class="value">{{ unshipped_orders|default:0 }}</div>
+  </div>
+  {% endif %}
 </div>
 
 <div class="split">