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/array/keyBy.js

@@ -0,0 +1,45 @@
+//#region src/array/keyBy.ts
+/**
+* Maps each element of an array based on a provided key-generating function.
+*
+* This function takes an array and a function that generates a key from each element. It returns
+* an object where the keys are the generated keys and the values are the corresponding elements.
+* If there are multiple elements generating the same key, the last element among them is used
+* as the value.
+*
+* @template T - The type of elements in the array.
+* @template K - The type of keys.
+* @param arr - The array of elements to be mapped.
+* @param getKeyFromItem - A function that generates a key from an element, its index, and the array.
+* @returns An object where keys are mapped to each element of an array.
+*
+* @example
+* const array = [
+*   { category: 'fruit', name: 'apple' },
+*   { category: 'fruit', name: 'banana' },
+*   { category: 'vegetable', name: 'carrot' }
+* ];
+* const result = keyBy(array, item => item.category);
+* // result will be:
+* // {
+* //   fruit: { category: 'fruit', name: 'banana' },
+* //   vegetable: { category: 'vegetable', name: 'carrot' }
+* // }
+*
+* @example
+* // Using index parameter
+* const items = ['a', 'b', 'c'];
+* const result = keyBy(items, (item, index) => index);
+* // result will be: { 0: 'a', 1: 'b', 2: 'c' }
+*/
+function keyBy(arr, getKeyFromItem) {
+	const result = {};
+	for (let i = 0; i < arr.length; i++) {
+		const item = arr[i];
+		const key = getKeyFromItem(item, i, arr);
+		result[key] = item;
+	}
+	return result;
+}
+//#endregion
+exports.keyBy = keyBy;