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/promise/index.d.ts

@@ -0,0 +1,7 @@
+import { allKeyed } from "./allKeyed.js";
+import { delay } from "./delay.js";
+import { Mutex } from "./mutex.js";
+import { Semaphore } from "./semaphore.js";
+import { timeout } from "./timeout.js";
+import { withTimeout } from "./withTimeout.js";
+export { Mutex, Semaphore, allKeyed, delay, timeout, withTimeout };