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/escapeRegExp.mjs

@@ -0,0 +1,17 @@
+//#region src/string/escapeRegExp.ts
+/**
+* Escapes the RegExp special characters "^", "$", "\\", ".", "*", "+", "?", "(", ")", "[", "]", "{", "}", and "|" in `str`.
+*
+* @param str The string to escape.
+* @returns Returns the escaped string.
+*
+* @example
+* import { escapeRegExp } from 'es-toolkit/string';
+*
+* escapeRegExp('[es-toolkit](https://es-toolkit.dev/)'); // returns '\[es-toolkit\]\(https://es-toolkit\.dev/\)'
+*/
+function escapeRegExp(str) {
+	return str.replace(/[\\^$.*+?()[\]{}|]/g, "\\$&");
+}
+//#endregion
+export { escapeRegExp };