chore(deps): upgrade to Next.js 16, Vitest 4, and Node.js 24

BREAKING CHANGES:
- Upgrade Next.js from 15.1.6 to 16.0.4
- Use Webpack instead of Turbopack for compatibility with server-side modules
- Upgrade Node.js requirement to >=24.0.0

FEATURES:
- Upgrade Vitest to 4.0.13 with improved testing capabilities
- Update all vitest-related packages (@vitest/ui, @vitest/coverage-v8)
- Upgrade react-syntax-highlighter to 16.1.0
- Update node-cron to 4.2.1
- Update lucide-react to 0.554.0

SECURITY:
- Resolve glob command injection vulnerability (CVE) via v10.5.0
- Fix all npm audit vulnerabilities (0 vulnerabilities found)
- Update prisma/client to 6.19.0
- Update all dependencies to latest secure versions

FIXES:
- Configure next.config.js for webpack with proper server-side module handling
- Update tsconfig.json for Next.js 16 compatibility (jsx: react-jsx)
- Add engines field to require Node.js >=24.0.0
- Remove deprecated webpack config in favor of Next.js 16 compatibility

tsconfig.json

@@ -22,7 +22,7 @@
     "noEmit": true,
     "module": "ESNext",
     "moduleResolution": "Bundler",
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "plugins": [
       {
         "name": "next"