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/array/countBy.js

@@ -0,0 +1,17 @@
+const require_isArrayLike = require("../predicate/isArrayLike.js");
+const require_iteratee = require("../util/iteratee.js");
+//#region src/compat/array/countBy.ts
+function countBy(collection, iteratee$1) {
+	if (collection == null) return {};
+	const array = require_isArrayLike.isArrayLike(collection) ? Array.from(collection) : Object.values(collection);
+	const mapper = require_iteratee.iteratee(iteratee$1 ?? void 0);
+	const result = Object.create(null);
+	for (let i = 0; i < array.length; i++) {
+		const item = array[i];
+		const key = mapper(item);
+		result[key] = (result[key] ?? 0) + 1;
+	}
+	return result;
+}
+//#endregion
+exports.countBy = countBy;