feat: comprehensive security and architecture improvements

- Add Zod validation schemas with strong password requirements (12+ chars, complexity)
- Implement rate limiting for authentication endpoints (registration, password reset)
- Remove duplicate MetricCard component, consolidate to ui/metric-card.tsx
- Update README.md to use pnpm commands consistently
- Enhance authentication security with 12-round bcrypt hashing
- Add comprehensive input validation for all API endpoints
- Fix security vulnerabilities in user registration and password reset flows

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

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

next.config.js

@@ -4,10 +4,7 @@
 const nextConfig = {
   reactStrictMode: true,
   // Allow cross-origin requests from specific origins in development
-  allowedDevOrigins: [
-    "localhost",
-    "127.0.0.1"
-  ],
+  allowedDevOrigins: ["localhost", "127.0.0.1"],
 };
 
 export default nextConfig;