feat: add Draw (Excalidraw) tool as 6th tool

- Added Draw tool to ToolsGrid with collaborative badges
- Updated Stats component to show 6 tools
- Updated Footer to show 6 tools and include Draw link
- Updated README with Draw tool description
- Draw tool accessible at draw.kit.pivoine.art

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/Stats.tsx

@@ -4,7 +4,7 @@ import { motion } from 'framer-motion';
 
 const stats = [
   {
-    number: '5',
+    number: '6',
     label: 'Tools',
     icon: (
       <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">