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/object/flattenObject.js

@@ -0,0 +1,52 @@
+const require_isPlainObject = require("../predicate/isPlainObject.js");
+//#region src/object/flattenObject.ts
+/**
+* Flattens a nested object into a single level object with delimiter-separated keys.
+*
+* @param object - The object to flatten.
+* @param [options.delimiter='.'] - The delimiter to use between nested keys.
+* @returns The flattened object.
+*
+* @example
+* const nestedObject = {
+*   a: {
+*     b: {
+*       c: 1
+*     }
+*   },
+*   d: [2, 3]
+* };
+*
+* const flattened = flattenObject(nestedObject);
+* console.log(flattened);
+* // Output:
+* // {
+* //   'a.b.c': 1,
+* //   'd.0': 2,
+* //   'd.1': 3
+* // }
+*/
+function flattenObject(object, { delimiter = "." } = {}) {
+	return flattenObjectImpl(object, "", delimiter);
+}
+function flattenObjectImpl(object, prefix, delimiter) {
+	const result = {};
+	const keys = Object.keys(object);
+	for (let i = 0; i < keys.length; i++) {
+		const key = keys[i];
+		const value = object[key];
+		const prefixedKey = prefix ? `${prefix}${delimiter}${key}` : key;
+		if (require_isPlainObject.isPlainObject(value) && Object.keys(value).length > 0) {
+			Object.assign(result, flattenObjectImpl(value, prefixedKey, delimiter));
+			continue;
+		}
+		if (Array.isArray(value) && value.length > 0) {
+			Object.assign(result, flattenObjectImpl(value, prefixedKey, delimiter));
+			continue;
+		}
+		result[prefixedKey] = value;
+	}
+	return result;
+}
+//#endregion
+exports.flattenObject = flattenObject;