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/functionsIn.d.ts

@@ -0,0 +1,21 @@
+//#region src/compat/object/functionsIn.d.ts
+/**
+ * Returns an array of property names whose values are functions, including inherited properties.
+ *
+ * @param object The object to inspect.
+ * @returns Returns the function names.
+ * @example
+ *
+ * function Foo() {
+ *   this.a = function() { return 'a'; };
+ *   this.b = function() { return 'b'; };
+ * }
+ *
+ * Foo.prototype.c = function() { return 'c'; };
+ *
+ * functionsIn(new Foo);
+ * // => ['a', 'b', 'c']
+ */
+declare function functionsIn<T extends {}>(object: any): string[];
+//#endregion
+export { functionsIn };