Complete llms.txt for AI coding tools

llms.txt now lists every guide, recipe and API reference page for V1 and V3, with each endpoint's method and URL. It opens with the essentials: base URLs, which calls need an access token and how to send it, pagination, data delays, errors, and rate limits. Point Cursor, Claude, or another AI coding tool at it to get accurate answers about the Yotpo UGC API.