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/function/negate.mjs

@@ -0,0 +1,19 @@
+//#region src/function/negate.ts
+/**
+* Creates a function that negates the result of the predicate function.
+*
+* @template F - The type of the function to negate.
+* @param func - The function to negate.
+* @returns The new negated function, which negates the boolean result of `func`.
+*
+* @example
+* const array = [1, 2, 3, 4, 5, 6];
+* const isEven = (n: number) => n % 2 === 0;
+* const result = array.filter(negate(isEven));
+* // result will be [1, 3, 5]
+*/
+function negate(func) {
+	return ((...args) => !func(...args));
+}
+//#endregion
+export { negate };