Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/es-toolkit/dist/array/forEachAsync.d.ts

@@ -0,0 +1,36 @@
+//#region src/array/forEachAsync.d.ts
+interface ForEachAsyncOptions {
+  concurrency?: number;
+}
+/**
+ * Executes an async callback function for each element in an array.
+ *
+ * Unlike the native `forEach`, this function returns a promise that resolves
+ * when all async operations complete. It supports optional concurrency limiting.
+ *
+ * @template T - The type of elements in the array.
+ * @param array The array to iterate over.
+ * @param callback An async function to execute for each element.
+ * @param [options] Optional configuration object.
+ * @param [options.concurrency] Maximum number of concurrent async operations. If not specified, all operations run concurrently.
+ * @returns A promise that resolves when all operations complete.
+ * @example
+ * const users = [{ id: 1 }, { id: 2 }, { id: 3 }];
+ * await forEachAsync(users, async (user) => {
+ *   await updateUser(user.id);
+ * });
+ * // All users have been updated
+ *
+ * @example
+ * // With concurrency limit
+ * const items = [1, 2, 3, 4, 5];
+ * await forEachAsync(
+ *   items,
+ *   async (item) => await processItem(item),
+ *   { concurrency: 2 }
+ * );
+ * // Processes at most 2 items concurrently
+ */
+declare function forEachAsync<T>(array: readonly T[], callback: (item: T, index: number, array: readonly T[]) => Promise<void>, options?: ForEachAsyncOptions): Promise<void>;
+//#endregion
+export { forEachAsync };