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/isNode.mjs

@@ -0,0 +1,20 @@
+//#region src/predicate/isNode.ts
+/**
+* Checks if the current environment is Node.js.
+*
+* This function checks for the existence of the `process.versions.node` property,
+* which only exists in Node.js environments.
+*
+* @returns `true` if the current environment is Node.js, otherwise `false`.
+*
+* @example
+* if (isNode()) {
+*   console.log('This is running in Node.js');
+*   const fs = import('node:fs');
+* }
+*/
+function isNode() {
+	return typeof process !== "undefined" && process?.versions?.node != null;
+}
+//#endregion
+export { isNode };