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/string/lowerFirst.mjs

@@ -0,0 +1,17 @@
+//#region src/string/lowerFirst.ts
+/**
+* Converts the first character of string to lower case.
+*
+* @param str - The string that is to be changed
+* @returns The converted string.
+*
+* @example
+* const convertedStr1 = lowerCase('fred') // returns 'fred'
+* const convertedStr2 = lowerCase('Fred') // returns 'fred'
+* const convertedStr3 = lowerCase('FRED') // returns 'fRED'
+*/
+function lowerFirst(str) {
+	return str.substring(0, 1).toLowerCase() + str.substring(1);
+}
+//#endregion
+export { lowerFirst };