feat(web): refresh palette, simplify ranking toolbar and drop export

reaction_board/web/static/api.js

@@ -44,10 +44,6 @@ export async function api(path, params) {
   return payload.data;
 }
 
-export function apiUrl(path, params) {
-  return buildUrl(path, params).toString();
-}
-
 export async function health() {
   const response = await fetch("/api/health", { credentials: "same-origin" });
   if (!response.ok) throw new ApiError("无法连接看板服务", response.status);