fix(ui): add window.FRONTEND_TYPE to standalone login pages

Login pages don't extend base templates, so they need the
FRONTEND_TYPE injection directly. Fixes "unknown" frontend
in dev toolbar and log prefixes on login pages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/tenancy/templates/tenancy/admin/login.html

@@ -177,6 +177,9 @@
 
     <!-- Scripts - ORDER MATTERS! -->
 
+    <!-- 0. Frontend type -->
+    <script>window.FRONTEND_TYPE = '{{ frontend_type | default("admin") }}';</script>
+
     <!-- 1. Log Configuration -->
     <script defer src="{{ url_for('static', path='shared/js/log-config.js') }}"></script>
 

app/modules/tenancy/templates/tenancy/merchant/login.html

@@ -178,6 +178,9 @@
 
     <!-- Scripts - ORDER MATTERS! -->
 
+    <!-- 0. Frontend type -->
+    <script>window.FRONTEND_TYPE = '{{ frontend_type | default("merchant") }}';</script>
+
     <!-- 1. Log Configuration -->
     <script defer src="{{ url_for('static', path='shared/js/log-config.js') }}"></script>
 

app/modules/tenancy/templates/tenancy/store/login.html

@@ -208,6 +208,9 @@
 
     <!-- Scripts - ORDER MATTERS! -->
 
+    <!-- 0. Frontend type -->
+    <script>window.FRONTEND_TYPE = '{{ frontend_type | default("store") }}';</script>
+
     <!-- 1. Log Configuration -->
     <script defer src="{{ url_for('static', path='shared/js/log-config.js') }}"></script>