feat(health): add database connectivity check to health endpoint

server/api/health.ts

@@ -1 +1,10 @@
-export default defineEventHandler(async () => ({ ok: true }));
+import prisma from '~~/lib/prisma';
+
+export default defineEventHandler(async (event) => {
+  const db = await prisma.$queryRaw`select 1;`
+    .then(() => true)
+    .catch(() => false);
+
+  setResponseStatus(event, db ? 200 : 500);
+  return { ok: true, db };
+});