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/workbox-precaching/addPlugins.d.ts

@@ -0,0 +1,11 @@
+import { WorkboxPlugin } from 'workbox-core/types.js';
+import './_version.js';
+/**
+ * Adds plugins to the precaching strategy.
+ *
+ * @param {Array<Object>} plugins
+ *
+ * @memberof workbox-precaching
+ */
+declare function addPlugins(plugins: WorkboxPlugin[]): void;
+export { addPlugins };