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/vite-plugin-pwa/dist/client/dev/preact.js

@@ -0,0 +1,16 @@
+// src/client/dev/preact.ts
+import { useState } from "preact/hooks";
+function useRegisterSW(_options = {}) {
+  const needRefresh = useState(false);
+  const offlineReady = useState(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    needRefresh,
+    offlineReady,
+    updateServiceWorker
+  };
+}
+export {
+  useRegisterSW
+};