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-abstract/helpers/every.js

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = function every(array, predicate) {
+	for (var i = 0; i < array.length; i += 1) {
+		if (!predicate(array[i], i, array)) {
+			return false;
+		}
+	}
+	return true;
+};