refactor: centralize gold tokens, extract sub-components, clean up unused code

- Replace hardcoded hex colors with gold/gold-light/gold-dark Tailwind tokens
- Extract Schedule into DayCard, ScheduleFilters, MobileSchedule sub-components
- Extract Team into TeamCarousel, TeamMemberInfo sub-components
- Add UI_CONFIG for centralized magic numbers (timings, thresholds)
- Add reusable IconBadge component, simplify Contact section
- Convert Pricing clickable divs to semantic buttons for a11y
- Remove unused SocialLinks, btn-outline, btn-ghost, nav-link CSS classes
- Fix React setState-during-render error in TeamCarousel (deferred update pattern)

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

src/lib/config.ts

@@ -0,0 +1,21 @@
+export const UI_CONFIG = {
+  scrollThresholds: {
+    header: 20,
+    backToTop: 600,
+  },
+  team: {
+    autoPlayMs: 4500,
+    pauseMs: 12000,
+    cardSpacing: 260,
+    stageHeight: 440,
+    floatingHeartsCount: 12,
+  },
+  faq: {
+    visibleCount: 4,
+  },
+  showcase: {
+    autoPlayInterval: 5000,
+    fadeMs: 250,
+    swipeThreshold: 50,
+  },
+} as const;

src/lib/constants.ts

@@ -16,6 +16,3 @@ export const NAV_LINKS: NavLink[] = [
   { label: "FAQ", href: "#faq" },
   { label: "Контакты", href: "#contact" },
 ];
-
-export const API_BASE_URL =
-  process.env.NEXT_PUBLIC_API_URL ?? "http://localhost:8000/api/v1";