Add minimal health check API

pages/api/health.js

@@ -0,0 +1,9 @@
+export default function handler(req, res) {
+  // Minimal health check - no external dependencies
+  res.status(200).json({
+    status: 'ok',
+    timestamp: new Date().toISOString(),
+    method: req.method,
+    url: req.url
+  });
+}