feature(BE): add customization for admin.site.site_header (#10179) to

* feature: add customization for admin.site.site_header

* fix: style issue

---------

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

src/backend/InvenTree/InvenTree/urls.py

@@ -39,10 +39,14 @@ from .api import (
     VersionTextView,
     VersionView,
 )
+from .config import get_setting
 from .magic_login import GetSimpleLoginView
 from .views import auth_request
 
-admin.site.site_header = 'InvenTree Admin'
+# Set admin header from config or use default
+admin.site.site_header = get_setting(
+    'INVENTREE_SITE_HEADER', 'customize.site_header', 'InvenTree Admin'
+)
 
 
 apipatterns = [

src/backend/InvenTree/config_template.yaml

@@ -217,6 +217,7 @@ ldap:
 # Customization options
 # Ref: https://docs.inventree.org/en/stable/start/config/#customization-options
 # customize:
+#   site_header: 'Custom Admin Panel'  # Django admin panel header text
 #   login_message: InvenTree demo instance - <a href='https://inventree.org/demo.html'> Click here for login details</a>
 #   navbar_message: <h6>InvenTree demo mode <a href='https://inventree.org/demo.html'><span class='fas fa-info-circle'></span></a></h6>
 #   hide_admin_link: true