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/fp/array/countBy.js

@@ -0,0 +1,26 @@
+const require_countBy = require("../../array/countBy.js");
+//#region src/fp/array/countBy.ts
+/**
+* Creates a function that counts values by a derived key.
+*
+* The mapper receives each value, its index, and the full input array. The returned object
+* uses mapper results as keys and occurrence counts as values.
+*
+* @template T - The type of elements in the array.
+* @template K - The property-key type produced by the mapper.
+* @param mapper - Called with each value, index, and array to produce a key.
+* @returns A function that maps a readonly array to counts by key.
+*
+* @example
+* import { countBy, pipe } from 'es-toolkit/fp';
+*
+* pipe([1, 2, 3, 4, 5], countBy(value => (value % 2 === 0 ? 'even' : 'odd')));
+* // => { odd: 3, even: 2 }
+*/
+function countBy(mapper) {
+	return function(array) {
+		return require_countBy.countBy(array, mapper);
+	};
+}
+//#endregion
+exports.countBy = countBy;