Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

apps/api/tests/db/test_seed.py

@@ -0,0 +1,32 @@
+from app.db.seed import run_seed
+from app.modules.users.repository import get_user_by_email
+
+
+def test_seed_ensures_admin_is_superuser():
+    admin = get_user_by_email("admin@compton.example")
+    assert admin is not None
+    admin.is_superuser = False
+    from app.modules.users import repository
+
+    repository.update_user(admin)
+
+    run_seed(include_demo_pages=False)
+
+    refreshed = get_user_by_email("admin@compton.example")
+    assert refreshed is not None
+    assert refreshed.is_superuser is True
+
+
+def test_seed_ensures_ops_is_not_superuser():
+    ops = get_user_by_email("ops@compton.example")
+    assert ops is not None
+    ops.is_superuser = True
+    from app.modules.users import repository
+
+    repository.update_user(ops)
+
+    run_seed(include_demo_pages=False)
+
+    refreshed = get_user_by_email("ops@compton.example")
+    assert refreshed is not None
+    assert refreshed.is_superuser is False