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/sum.mjs

@@ -0,0 +1,23 @@
+import { sumBy } from "./sumBy.mjs";
+//#region src/compat/math/sum.ts
+/**
+* Computes the sum of the values that are returned by the `iteratee` function.
+*
+* It does not coerce values to `number`.
+*
+* @param array - The array to iterate over.
+* @returns Returns the sum.
+*
+* @example
+* sum([1, 2, 3]); // => 6
+* sum([1n, 2n, 3n]); // => 6n
+* sum(["1", "2"]); // => "12"
+* sum([1, undefined, 2]); // => 3
+* sum(null); // => 0
+* sum(undefined); // => 0
+*/
+function sum(array) {
+	return sumBy(array);
+}
+//#endregion
+export { sum };