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/predicate/isRegExp.mjs

@@ -0,0 +1,19 @@
+//#region src/predicate/isRegExp.ts
+/**
+* Checks if `value` is a RegExp.
+*
+* @param value The value to check.
+* @returns Returns `true` if `value` is a RegExp, `false` otherwise.
+*
+* @example
+* const value1 = /abc/;
+* const value2 = '/abc/';
+*
+* console.log(isRegExp(value1)); // true
+* console.log(isRegExp(value2)); // false
+*/
+function isRegExp(value) {
+	return value instanceof RegExp;
+}
+//#endregion
+export { isRegExp };