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/string/toUpper.mjs

@@ -0,0 +1,24 @@
+import { toString } from "../util/toString.mjs";
+//#region src/compat/string/toUpper.ts
+/**
+* Converts `string`, as a whole, to upper case just like
+* [String#toUpperCase](https://mdn.io/toUpperCase).
+*
+* @param [value=''] The value to convert.
+* @returns Returns the upper cased string.
+* @example
+*
+* toUpper('--foo-bar--');
+* // => '--FOO-BAR--'
+*
+* toUpper(null);
+* // => ''
+*
+* toUpper([1, 2, 3]);
+* // => '1,2,3'
+*/
+function toUpper(value) {
+	return toString(value).toUpperCase();
+}
+//#endregion
+export { toUpper };