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/recharts/es6/util/payload/getUniqPayload.js

@@ -0,0 +1,19 @@
+import uniqBy from 'es-toolkit/compat/uniqBy';
+
+/**
+ * This is configuration option that decides how to filter for unique values only:
+ *
+ * - `false` means "no filter"
+ * - `true` means "use recharts default filter"
+ * - function means "use return of this function as the default key"
+ */
+
+export function getUniqPayload(payload, option, defaultUniqBy) {
+  if (option === true) {
+    return uniqBy(payload, defaultUniqBy);
+  }
+  if (typeof option === 'function') {
+    return uniqBy(payload, option);
+  }
+  return payload;
+}