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/functions.d.mts

@@ -0,0 +1,21 @@
+//#region src/compat/object/functions.d.ts
+/**
+ * Creates an array of property names from an object where the property values are functions.
+ *
+ * @param object - The object to inspect.
+ * @returns An array of function property names.
+ *
+ * @example
+ * function Foo() {
+ *   this.a = () => 'a';
+ *   this.b = () => 'b';
+ * }
+ *
+ * Foo.prototype.c = () => 'c';
+ *
+ * functions(new Foo);
+ * // => ['a', 'b']
+ */
+declare function functions(object: any): string[];
+//#endregion
+export { functions };