驗證端點
POST /experiments/booking-access/verify
答案 Secret
ACCESS_ANSWERS_JSON：用題目編號 1–5 對應答案；以下只列空白格式。
{"1":"","2":"","3":"","4":"","5":""}
簽章 Secret
ACCESS_SESSION_SECRET：至少 32 個隨機 bytes。答案與簽章值只填在 Cloudflare，不會放進本頁或 Git。
Cloudflare Dashboard → Workers & Pages → jianjian-demo → Settings → Variables and Secrets → Production