Multitenant implementation with custom Domain, theme per vendor

app/api/v1/admin/pages.py

@@ -17,6 +17,7 @@ Routes:
 - GET /vendors/{vendor_code} → Vendor details (auth required)
 - GET /vendors/{vendor_code}/edit → Edit vendor form (auth required)
 - GET /vendors/{vendor_code}/domains → Vendor domains management (auth required)
+- GET /vendors/{vendor_code}/theme → Vendor theme editor (auth required)
 - GET /users         → User management page (auth required)
 - GET /imports       → Import history page (auth required)
 - GET /settings      → Settings page (auth required)
@@ -205,6 +206,7 @@ async def admin_vendor_theme_page(
 ):
     """
     Render vendor theme customization page.
+    Allows admins to customize colors, fonts, layout, and branding.
     """
     return templates.TemplateResponse(
         "admin/vendor-theme.html",