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/set/forEach.d.ts

@@ -0,0 +1,25 @@
+//#region src/set/forEach.d.ts
+/**
+ * Executes a provided function once for each element in a Set.
+ *
+ * This function iterates through all elements of the Set and executes the callback function
+ * for each element. The callback receives the value twice (for consistency with Map.forEach)
+ * and the Set itself as arguments.
+ *
+ * @template T - The type of elements in the Set.
+ * @param set - The Set to iterate over.
+ * @param callback - A function to execute for each element.
+ *
+ * @example
+ * const set = new Set([1, 2, 3]);
+ * forEach(set, (value) => {
+ *   console.log(value * 2);
+ * });
+ * // Output:
+ * // 2
+ * // 4
+ * // 6
+ */
+declare function forEach<T>(set: Set<T>, callback: (value: T, value2: T, set: Set<T>) => void): void;
+//#endregion
+export { forEach };