feat: add CI unit test, /api/health, Dockerfile HEALTHCHECK, bundle-analyzer

src/app/api/health/route.ts

@@ -0,0 +1,10 @@
+import { NextResponse } from "next/server"
+
+export const dynamic = "force-dynamic"
+
+export async function GET(): Promise<NextResponse<{ status: string; timestamp: string }>> {
+  return NextResponse.json({
+    status: "ok",
+    timestamp: new Date().toISOString(),
+  })
+}