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/async/internal/breakLoop.js

@@ -0,0 +1,10 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+// A temporary value used to identify if the loop should be broken.
+// See #1064, #1293
+const breakLoop = {};
+exports.default = breakLoop;
+module.exports = exports.default;