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/math/meanBy.mjs

@@ -0,0 +1,32 @@
+import { identity } from "../../function/identity.mjs";
+import { meanBy as meanBy$1 } from "../../math/meanBy.mjs";
+import { iteratee } from "../util/iteratee.mjs";
+//#region src/compat/math/meanBy.ts
+/**
+* Calculates the average of an array of numbers when applying
+* the `iteratee` function to each element.
+*
+* If the array is empty, this function returns `NaN`.
+*
+* @template T - The type of elements in the array.
+* @param items An array to calculate the average.
+* @param iteratee
+* The criteria used to determine the maximum value.
+*  - If a **function** is provided, it extracts a numeric value from each element.
+*  - If a **string** is provided, it is treated as a key to extract values from the objects.
+*  - If a **[key, value]** pair is provided, it matches elements with the specified key-value pair.
+*  - If an **object** is provided, it matches elements that contain the specified properties.
+* @returns The average of all the numbers as determined by the `iteratee` function.
+*
+* @example
+* meanBy([{ a: 1 }, { a: 2 }, { a: 3 }], x => x.a); // Returns: 2
+* meanBy([], x => x.a); // Returns: NaN
+* meanBy([[2], [3], [1]], 0); // Returns: 2
+* meanBy([{ a: 2 }, { a: 3 }, { a: 1 }], 'a'); // Returns: 2
+*/
+function meanBy(items, iteratee$1) {
+	if (items == null) return NaN;
+	return meanBy$1(Array.from(items), iteratee(iteratee$1 ?? identity));
+}
+//#endregion
+export { meanBy };