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/pick.d.ts

@@ -0,0 +1,21 @@
+//#region src/object/pick.d.ts
+/**
+ * Creates a new object composed of the picked object properties.
+ *
+ * This function takes an object and an array of keys, and returns a new object that
+ * includes only the properties corresponding to the specified keys.
+ *
+ * @template T - The type of object.
+ * @template K - The type of keys in object.
+ * @param obj - The object to pick keys from.
+ * @param keys - An array of keys to be picked from the object.
+ * @returns A new object with the specified keys picked.
+ *
+ * @example
+ * const obj = { a: 1, b: 2, c: 3 };
+ * const result = pick(obj, ['a', 'c']);
+ * // result will be { a: 1, c: 3 }
+ */
+declare function pick<T extends Record<string, any>, K extends keyof T>(obj: T, keys: readonly K[]): Pick<T, K>;
+//#endregion
+export { pick };