feat: add Figlet ASCII art generator as 7th tool

- Added Figlet tool with 373 fonts for ASCII art text generation
- Created new gradient-yellow-amber for terminal/retro aesthetic
- Updated Stats component from 6 to 7 tools
- Updated Footer badge to 7 tools and added Figlet link
- Added Figlet to README Available Tools section

Figlet Features:
- 373 curated fonts from xero/figlet-fonts collection
- Live preview and fuzzy search
- Multiple export formats (text, PNG, SVG, code snippets)
- Shareable URLs and keyboard shortcuts
- Perfect for ASCII banners, terminal art, and retro designs

Color: Yellow (#eab308) to Amber (#f59e0b) gradient
URL: https://figlet.kit.pivoine.art

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

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

README.md

@@ -137,6 +137,7 @@ Tailwind CSS 4 uses a new CSS-first configuration approach:
 - **Stirling** - Powerful PDF toolkit with 50+ operations (merge, split, convert, OCR, sign)
 - **Units** - Smart unit converter with 187 units across 23 categories (length, mass, temperature, etc.)
 - **Draw** - Virtual whiteboard for sketching hand-drawn style diagrams (flowcharts, wireframes, collaborative editing)
+- **Figlet** - ASCII art text generator with 373 fonts (text banners, terminal art, retro designs)
 
 ## CI/CD Pipeline