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/invert.d.ts

@@ -0,0 +1,14 @@
+//#region src/compat/object/invert.d.ts
+/**
+ * Inverts the keys and values of an object.
+ *
+ * @param object - The object to invert.
+ * @returns Returns the new inverted object.
+ *
+ * @example
+ * invert({ a: 1, b: 2, c: 3 });
+ * // => { '1': 'a', '2': 'b', '3': 'c' }
+ */
+declare function invert(object: object): Record<string, string>;
+//#endregion
+export { invert };