feat: add interactive tutorial slideshow app

Create apps/tutorial - a beautiful, animated Next.js slideshow that explains
TPMJS concepts from basic to advanced:

Slides:
- Welcome: Gradient TPMJS title with animated floating orbs
- Problem: Chaotic floating icons showing fragmented AI tools
- Solution: Icons organizing into a neat grid
- How It Works: Flow diagram (npm → Discovery → Registry → AI Agent)
- Discovery: Animated counters showing real-time sync stats
- Integration: Typewriter code animation showing SDK usage
- Quality Scoring: Animated gauge and progress bars
- Tool Detail: Mock tool card with all metadata
- Get Started: CTA buttons linking to tpmjs.com

Features:
- Framer Motion animations with spring physics
- Keyboard navigation (arrows, space, enter)
- Mouse navigation (arrows, progress dots)
- Touch-friendly swipe support
- Dark theme with cyan/purple gradient accents
- Responsive design

apps/tutorial/postcss.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};