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/compat/object/at.d.ts

@@ -0,0 +1,34 @@
+//#region src/compat/object/at.d.ts
+type PropertyName = string | number | symbol;
+type Many<T> = T | readonly T[];
+type PropertyPath = Many<PropertyName>;
+/**
+ * Gets values at given paths from a dictionary or numeric dictionary.
+ *
+ * @template T - The type of the values in the dictionary.
+ * @param object - The dictionary to query.
+ * @param props - The property paths to get values for.
+ * @returns Returns an array of the picked values.
+ *
+ * @example
+ * const object = { 'a': 1, 'b': 2, 'c': 3 };
+ * at(object, 'a', 'c');
+ * // => [1, 3]
+ */
+declare function at<T>(object: Record<string, T> | Record<number, T> | null | undefined, ...props: PropertyPath[]): T[];
+/**
+ * Gets values at given keys from an object.
+ *
+ * @template T - The type of the object.
+ * @param object - The object to query.
+ * @param props - The property keys to get values for.
+ * @returns Returns an array of the picked values.
+ *
+ * @example
+ * const object = { 'a': 1, 'b': 2, 'c': 3 };
+ * at(object, 'a', 'c');
+ * // => [1, 3]
+ */
+declare function at<T extends object>(object: T | null | undefined, ...props: Array<Many<keyof T>>): Array<T[keyof T]>;
+//#endregion
+export { at };