fix: switch Google Fonts to runtime <link> tags for build environments without internet

- Replace next/font/google with <link> tags in <head> (loads fonts client-side at runtime)
- Define --font-nunito and --font-pixel CSS variables in globals.css with font-family fallbacks
- Remove @prisma/client from serverExternalPackages in next.config.ts (devDep only)

next.config.ts

@@ -22,9 +22,7 @@ const securityHeaders = [
 const nextConfig: NextConfig = {
 	turbopack: {},
 	serverExternalPackages: [
-		"@prisma/adapter-mariadb",
 		"mariadb",
-		"@prisma/client",
 		"lzma",
 		"sharp",
 		"pino",