feat: add schedule section with location tabs, filters, and status badges

Two locations (Притыцкого 62/М, Машерова 17/4) with day-grid layout,
class type/trainer/status filters, and badges for availability and recruiting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/constants.ts

@@ -11,6 +11,7 @@ export const NAV_LINKS: NavLink[] = [
   { label: "О нас", href: "#about" },
   { label: "Команда", href: "#team" },
   { label: "Направления", href: "#classes" },
+  { label: "Расписание", href: "#schedule" },
   { label: "Стоимость", href: "#pricing" },
   { label: "FAQ", href: "#faq" },
   { label: "Контакты", href: "#contact" },