docs(usage): per-user Claude token tracking - Usage.md: new "Per-user учёт токенов Claude" section with endpoints and links to UIs - Users.md: add "Токены" column row to members table description - Mobile-App.md: new "Индикатор использования" subsection in Chat screen describing both context bar and period bar
docs: add Mobile-App, WooCommerce, Users pages + update navigation