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/utils/fontUtils.ts

@@ -0,0 +1,34 @@
+// Font utility functions
+
+/**
+ * Generate Google Fonts import URL for a list of fonts
+ */
+export const generateGoogleFontsImport = (fonts: string[]): string => {
+  const familyParams = fonts
+    .map(f => `family=${encodeURIComponent(f)}:wght@400;500;600;700`)
+    .join('&');
+  return `https://fonts.googleapis.com/css2?${familyParams}&display=swap`;
+};
+
+/**
+ * Extract unique fonts from a style's word config
+ */
+export const extractFontsFromStyle = (wordConfig: {
+  heading1: { font: string };
+  heading2: { font: string };
+  body: { font: string };
+}): string[] => {
+  return Array.from(new Set([
+    wordConfig.heading1.font,
+    wordConfig.heading2.font,
+    wordConfig.body.font
+  ])).filter(Boolean);
+};
+
+/**
+ * Check if a font is available system-wide
+ */
+export const isSystemFont = (font: string): boolean => {
+  const systemFonts = ['Arial', 'Georgia', 'Times New Roman', 'Courier New', 'Verdana'];
+  return systemFonts.includes(font);
+};