feat(@pulse-libs/ui): design system completo compartilhado

- Atoms (10): Button, Badge, Card, GradientText, Divider, ThemeToggle + 4 3D stubs
- Molecules (3): FeatureCard, Navbar, Footer
- Organisms (4): HeroSection, FeaturesGrid, CtaBlock, StatsGrid
- Templates (3): MainLayout, MinimalLayout, PageWithSidebar
- TOKENS export: color/space/radius constants
- Re-export pattern em todos os indices
- MIT 2026 — Atomic Design · TypeScript · React 18

package.json

@@ -0,0 +1,9 @@
+{
+  "name": "@pulse-libs/ui",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "./src/index.ts",
+  "exports": { ".": "./src/index.ts" },
+  "peerDependencies": { "react": "^18" }
+}