feat: port all template categories to JSON format

- Ported Minimalist templates to JSON (Swiss Grid, Brutalist, etc.)
- Ported Tech templates to JSON (SaaS, Terminal, Cyberpunk, etc.)
- Ported Creative templates to JSON (Art Gallery, Zine, Pop Art, etc.)
- Ported Industrial templates to JSON (Blueprint, Factory, Schematic, etc.)
- Ported Nature templates to JSON (Botanical, Ocean, Mountain, etc.)
- Ported Lifestyle templates to JSON (Cookbook, Travel, Coffee House, etc.)
- Ported Vintage templates to JSON (Art Deco, Medieval, Retro 80s, etc.)
- Updated README.md to reflect the new JSON-based style system (example configuration and contribution workflow)
- Completed migration of over 150 styles to the new architecture

src/styles/templates/creative/street-art-graffiti.ts

@@ -0,0 +1,34 @@
+import { StyleOption } from '../../../types';
+
+export const streetArtGraffiti: StyleOption = {
+    id: 'street-art-graffiti',
+    name: 'Street Art Graffiti',
+    category: 'Creative',
+    description: 'Urban street style. Spray paint fonts, dripping effects, and concrete vibes.',
+    vibe: 'Urban, Rebel, Spray',
+    googleFontsImport: 'https://fonts.googleapis.com/css2?family=Permanent+Marker&family=Rock+Salt&display=swap',
+    wordConfig: {
+      heading1: { 
+        font: "Permanent Marker", size: 48, color: "000000", bold: false, align: 'center',
+        spacing: { before: 400, after: 200, line: 240 },
+        shading: { fill: "FFFF00", color: "auto", style: "clear" } // Hazard Yellow
+      },
+      heading2: { 
+        font: "Rock Salt", size: 18, color: "FF0000", bold: false, align: 'left',
+        spacing: { before: 320, after: 160, line: 240 }
+      },
+      body: { 
+        font: "Permanent Marker", size: 12, color: "333333", align: 'left',
+        spacing: { before: 0, after: 160, line: 280 } 
+      },
+      accentColor: "000000"
+    },
+    previewCss: `
+      font-family: 'Permanent Marker', cursive;
+      background: #F0F0F0;
+      h1 { font-size: 48pt; color: #000000; text-align: center; background: #FFFF00; padding: 10px; transform: rotate(-2deg); margin-bottom: 24px; box-shadow: 4px 4px 0 #000; }
+      h2 { font-family: 'Rock Salt', cursive; font-size: 18pt; color: #FF0000; margin-top: 32px; margin-bottom: 16px; transform: rotate(1deg); }
+      p { font-size: 12pt; line-height: 1.6; color: #333333; margin-bottom: 14px; }
+      blockquote { border-left: 5px solid #000; padding-left: 16px; margin: 24px 0; font-family: 'Rock Salt', cursive; font-size: 10pt; }
+    `
+  };