feat: add user authentication UI to header component

Add login and register dialogs, user dropdown menu with profile link and logout option, and integrate with session management hook. Prevent hydration mismatches by conditionally rendering auth elements after mount. Update package-lock.json with new @esbuild dependencies for build tooling.

lib/rate-limiter.ts

@@ -35,6 +35,22 @@ const RATE_LIMITS: Record<string, RateLimitConfig> = {
     maxRequests: 100,
     windowMs: 60 * 1000, // 1 minuto
   },
+  "/api/auth/register": {
+    maxRequests: 5,
+    windowMs: 10 * 60 * 1000, // 10 minutos
+  },
+  "/api/auth/login": {
+    maxRequests: 10,
+    windowMs: 60 * 1000, // 1 minuto
+  },
+  "/api/auth/refresh": {
+    maxRequests: 20,
+    windowMs: 60 * 1000, // 1 minuto
+  },
+  "/api/auth/me": {
+    maxRequests: 30,
+    windowMs: 60 * 1000, // 1 minuto
+  },
 };
 
 // Limpar cache expirado a cada 5 minutos