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/function/flip.d.ts

@@ -0,0 +1,19 @@
+//#region src/compat/function/flip.d.ts
+/**
+ * Reverses the order of arguments for a given function.
+ *
+ * @template T - The type of the function being flipped.
+ * @param func - The function whose arguments will be reversed.
+ * @returns A new function that takes the reversed arguments and returns the result of calling `func`.
+ *
+ * @example
+ * var flipped = flip(function() {
+ *   return Array.prototype.slice.call(arguments);
+ * });
+ *
+ * flipped('a', 'b', 'c', 'd');
+ * // => ['d', 'c', 'b', 'a']
+ */
+declare function flip<T extends (...args: any) => any>(func: T): T;
+//#endregion
+export { flip };