Add a shop sales dashboard with 30-day charts.

Portal Retail gets a Sales page for paid/fulfilled volume, daily bars, and top products so FEATURE_SHOP sites can see store performance without a third-party analytics tool.

Closes #7

site/public/context_processors.py

@@ -63,6 +63,15 @@ def tianji_tracking(request):
         nav_section = "social_accounts"
     elif namespace == "social":
         nav_section = "social"
+    elif namespace == "shop_portal":
+        if url_name.startswith("product"):
+            nav_section = "shop_products"
+        elif url_name.startswith("order"):
+            nav_section = "shop_orders"
+        elif url_name == "sales":
+            nav_section = "shop_sales"
+    elif namespace == "shop":
+        nav_section = "shop"
 
     return {
         "tianji_enabled": getattr(settings, "TIANJI_ENABLED", False)