Markets category replaces Kiosk in seed data

- Updated seed categories: Kiosk → Markets

admin_server.py

@@ -312,7 +312,7 @@ def _seed_data(conn: sqlite3.Connection):
     _seed_if_empty(conn, "categories", ("name", "icon"), [
         ("Bev", "🥤"), ("Snack", "🍿"),
         ("Food", "🍔"), ("Equipment", "🔧"),
-        ("Appliances", "🔌"), ("Kiosk", "🏪"),
+        ("Appliances", "🔌"), ("Markets", "🏪"),
         ("Coffee", "☕"),
         ("Other", "📦"),
     ])