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/findKey.d.ts

@@ -0,0 +1,18 @@
+import { ObjectIteratee } from "../_internal/ObjectIteratee.js";
+
+//#region src/compat/object/findKey.d.ts
+/**
+ * Finds the key of the first element that matches the given predicate.
+ *
+ * This function determines the type of the predicate and delegates the search
+ * to the appropriate helper function. It supports predicates as functions, objects,
+ * arrays, or strings.
+ *
+ * @template T - The type of the object.
+ * @param obj - The object to inspect.
+ * @param predicate - The predicate to match.
+ * @returns Returns the key of the matched element, else `undefined`.
+ */
+declare function findKey<T>(obj: T | null | undefined, predicate?: ObjectIteratee<T>): string | undefined;
+//#endregion
+export { findKey };