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/invert.js

@@ -0,0 +1,31 @@
+//#region src/object/invert.ts
+/**
+* Inverts the keys and values of an object. The keys of the input object become the values of the output object and vice versa.
+*
+* This function takes an object and creates a new object by inverting its keys and values. If the input object has duplicate values,
+* the key of the last occurrence will be used as the value for the new key in the output object. It effectively creates a reverse mapping
+* of the input object's key-value pairs.
+*
+* @template K - Type of the keys in the input object (string, number, symbol)
+* @template V - Type of the values in the input object (string, number, symbol)
+* @param obj - The input object whose keys and values are to be inverted
+* @returns A new object with keys and values inverted
+*
+* @example
+* invert({ a: 1, b: 2, c: 3 }); // { 1: 'a', 2: 'b', 3: 'c' }
+* invert({ 1: 'a', 2: 'b', 3: 'c' }); // { a: '1', b: '2', c: '3' }
+* invert({ a: 1, 2: 'b', c: 3, 4: 'd' }); // { 1: 'a', b: '2', 3: 'c', d: '4' }
+* invert({ a: Symbol('sym1'), b: Symbol('sym2') }); // { [Symbol('sym1')]: 'a', [Symbol('sym2')]: 'b' }
+*/
+function invert(obj) {
+	const result = {};
+	const keys = Object.keys(obj);
+	for (let i = 0; i < keys.length; i++) {
+		const key = keys[i];
+		const value = obj[key];
+		result[value] = key;
+	}
+	return result;
+}
+//#endregion
+exports.invert = invert;