frontend/src/api.js

/** API base URL from Vercel env; empty uses same-origin paths (Vercel rewrites → Render). */
export const API_BASE = (import.meta.env.VITE_API_URL ?? "").replace(/\/$/, "");

export function apiUrl(path) {
  const normalized = path.startsWith("/") ? path : `/${path}`;
  return `${API_BASE}${normalized}`;
}