fix: update auth test to expect numeric user ID from /me endpoint

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/routes/auth.test.ts

@@ -66,7 +66,7 @@ describe("Auth Routes", () => {
 			expect(res.status).toBe(200);
 			const body = await res.json();
 			expect(body.authenticated).toBe(true);
-			expect(body.user.id).toBe("logto-user-abc123");
+			expect(typeof body.user.id).toBe("number");
 			expect(body.user.email).toBe("user@example.com");
 		});
 	});