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/unzip.d.ts

@@ -0,0 +1,18 @@
+//#region src/array/unzip.d.ts
+/**
+ * Gathers elements in the same position in an internal array
+ * from a grouped array of elements and returns them as a new array.
+ *
+ * @template T - The type of elements in the nested array.
+ * @param zipped - The nested array to unzip.
+ * @returns A new array of unzipped elements.
+ *
+ * @example
+ * const zipped = [['a', true, 1],['b', false, 2]];
+ * const result = unzip(zipped);
+ * // result will be [['a', 'b'], [true, false], [1, 2]]
+ */
+declare function unzip<T extends unknown[]>(zipped: ReadonlyArray<[...T]>): Unzip<T>;
+type Unzip<K extends unknown[]> = { [I in keyof K]: Array<K[I]> };
+//#endregion
+export { unzip };