feat: harden bootstrap and add tests

src/app/api/health/route.ts

@@ -0,0 +1,19 @@
+import { NextResponse } from 'next/server';
+
+export const dynamic = 'force-dynamic';
+
+export async function GET() {
+  return NextResponse.json(
+    {
+      ok: true,
+      status: 'healthy',
+      timestamp: new Date().toISOString(),
+    },
+    {
+      status: 200,
+      headers: {
+        'cache-control': 'no-store, max-age=0',
+      },
+    }
+  );
+}