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/reduceAsync.d.ts

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+//#region src/array/reduceAsync.d.ts
+/**
+ * Reduces an array to a single value using an async reducer function.
+ *
+ * Applies the reducer function sequentially to each element (left to right),
+ * carrying an accumulated result from one call to the next. Unlike other async
+ * array methods, reduce must process elements sequentially and does not support
+ * concurrency limiting.
+ *
+ * @template T - The type of elements in the array.
+ * @template U - The type of the accumulated result.
+ * @param array The array to reduce.
+ * @param reducer An async function that processes each element.
+ * @param initialValue The initial value of the accumulator.
+ * @returns A promise that resolves to the final accumulated value.
+ * @example
+ * const numbers = [1, 2, 3, 4, 5];
+ * const sum = await reduceAsync(
+ *   numbers,
+ *   async (acc, n) => acc + await fetchValue(n),
+ *   0
+ * );
+ * // Returns: sum of all fetched values
+ *
+ * @example
+ * const users = [{ id: 1 }, { id: 2 }, { id: 3 }];
+ * const userMap = await reduceAsync(
+ *   users,
+ *   async (acc, user) => {
+ *     const details = await fetchUserDetails(user.id);
+ *     acc[user.id] = details;
+ *     return acc;
+ *   },
+ *   {} as Record<number, any>
+ * );
+ * // Returns: { 1: {...}, 2: {...}, 3: {...} }
+ */
+declare function reduceAsync<T, U>(array: readonly T[], reducer: (accumulator: U, currentValue: T, currentIndex: number, array: readonly T[]) => Promise<U>, initialValue: U): Promise<U>;
+/**
+ * Reduces an array to a single value using an async reducer function.
+ *
+ * Applies the reducer function sequentially to each element (left to right),
+ * carrying an accumulated result from one call to the next. Unlike other async
+ * array methods, reduce must process elements sequentially and does not support
+ * concurrency limiting.
+ *
+ * When no initial value is provided, the first element of the array is used as
+ * the initial value and the reduction starts from the second element.
+ *
+ * @template T - The type of elements in the array.
+ * @param array The array to reduce.
+ * @param reducer An async function that processes each element.
+ * @returns A promise that resolves to the final accumulated value, or undefined if the array is empty.
+ * @example
+ * const numbers = [1, 2, 3, 4, 5];
+ * const sum = await reduceAsync(
+ *   numbers,
+ *   async (acc, n) => acc + n
+ * );
+ * // Returns: 15
+ *
+ * @example
+ * const emptyArray: number[] = [];
+ * const result = await reduceAsync(
+ *   emptyArray,
+ *   async (acc, n) => acc + n
+ * );
+ * // Returns: undefined
+ */
+declare function reduceAsync<T>(array: readonly T[], reducer: (accumulator: T, currentValue: T, currentIndex: number, array: readonly T[]) => Promise<T>): Promise<T>;
+//#endregion
+export { reduceAsync };