Playwright 기반 E2E 테스트 추가

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/e2e/support/global-setup.ts

@@ -0,0 +1,15 @@
+import { BASE_URL } from "./app.ts";
+
+// Waits until the app is ready (e.g. migrations are done)
+export default async function globalSetup() {
+  for (let i = 0; i < 120; i++) {
+    try {
+      const res = await fetch(`${BASE_URL}/auth/login`);
+      if (res.ok) return;
+    } catch {
+      // Not ready yet
+    }
+    await new Promise((resolve) => setTimeout(resolve, 500));
+  }
+  throw new Error("The app didn't start");
+}