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/pickBy.d.ts

@@ -0,0 +1,23 @@
+//#region src/object/pickBy.d.ts
+/**
+ * Creates a new object composed of the properties that satisfy the predicate function.
+ *
+ * This function takes an object and a predicate function, and returns a new object that
+ * includes only the properties for which the predicate function returns true.
+ *
+ * @template T - The type of object.
+ * @param obj - The object to pick properties from.
+ * @param shouldPick - A predicate function that determines
+ * whether a property should be picked. It takes the property's key and value as arguments and returns `true`
+ * if the property should be picked, and `false` otherwise.
+ * @returns A new object with the properties that satisfy the predicate function.
+ *
+ * @example
+ * const obj = { a: 1, b: 'pick', c: 3 };
+ * const shouldPick = (value) => typeof value === 'string';
+ * const result = pickBy(obj, shouldPick);
+ * // result will be { b: 'pick' }
+ */
+declare function pickBy<T extends Record<string, any>>(obj: T, shouldPick: (value: T[keyof T], key: keyof T) => boolean): Partial<T>;
+//#endregion
+export { pickBy };