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/range.js

@@ -0,0 +1,14 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = range;
+function range(size) {
+    var result = Array(size);
+    while (size--) {
+        result[size] = size;
+    }
+    return result;
+}
+module.exports = exports.default;