refactor(frontend): ♻️ update API folder structure

frontend/api/admin/admin-about.ts

@@ -0,0 +1,47 @@
+import { BaseAPI } from "../_base";
+
+const prefix = "/api";
+
+const routes = {
+  about: `${prefix}/admin/about`,
+  aboutStatistics: `${prefix}/admin/about/statistics`,
+  check: `${prefix}/admin/about/check`,
+};
+
+export interface AdminAboutInfo {
+  production: boolean;
+  version: string;
+  demoStatus: boolean;
+  apiPort: number;
+  apiDocs: boolean;
+  dbType: string;
+  dbUrl: string;
+  defaultGroup: string;
+}
+
+export interface AdminStatistics {
+  totalRecipes: number;
+  totalUsers: number;
+  totalGroups: number;
+  uncategorizedRecipes: number;
+  untaggedRecipes: number;
+}
+
+export interface CheckAppConfig {
+  emailReady: boolean;
+  baseUrlSet: boolean;
+}
+
+export class AdminAboutAPI extends BaseAPI {
+  async about() {
+    return await this.requests.get<AdminAboutInfo>(routes.about);
+  }
+
+  async statistics() {
+    return await this.requests.get(routes.aboutStatistics);
+  }
+
+  async checkApp() {
+    return await this.requests.get<CheckAppConfig>(routes.check);
+  }
+}