Get the widget settings (public)

Called by the chat widget in the visitor's browser, with the public chat token in ?token= and the Origin header of the page. No API key. Returns what the widget shows before a conversation starts: the project name, the greeting, the language and whether a bot check is needed. Every /public route allows CORS only for an allowed origin (with an OPTIONS preflight), and any reason that concerns you rather than the visitor (balance, verification, the daily spending limit) returns 503 chat_unavailable, without details; the real reason is in the portal. All /public requests combined: at most 60 per minute per IP address.