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/object/mapKeys.d.ts

@@ -0,0 +1,21 @@
+//#region src/object/mapKeys.d.ts
+/**
+ * Creates a new object with the same values as the given object, but with keys generated
+ * by running each own enumerable property of the object through the iteratee function.
+ *
+ * @template T - The type of the object.
+ * @template K - The type of the new keys generated by the iteratee function.
+ *
+ * @param object - The object to iterate over.
+ * @param getNewKey - The function invoked per own enumerable property.
+ * @returns Returns the new mapped object.
+ *
+ * @example
+ * // Example usage:
+ * const obj = { a: 1, b: 2 };
+ * const result = mapKeys(obj, (value, key) => key + value);
+ * console.log(result); // { a1: 1, b2: 2 }
+ */
+declare function mapKeys<T extends Record<PropertyKey, any>, K extends PropertyKey>(object: T, getNewKey: (value: T[keyof T], key: keyof T, object: T) => K): Record<K, T[keyof T]>;
+//#endregion
+export { mapKeys };