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/compat/object/keys.d.ts

@@ -0,0 +1,23 @@
+//#region src/compat/object/keys.d.ts
+/**
+ * Creates an array of the own enumerable property names of `object`.
+ *
+ * Non-object values are coerced to objects.
+ *
+ * @param object The object to query.
+ * @returns Returns the array of property names.
+ * @example
+ * function Foo() {
+ *   this.a = 1;
+ *   this.b = 2;
+ * }
+ * Foo.prototype.c = 3;
+ * keys(new Foo); // ['a', 'b'] (iteration order is not guaranteed)
+ *
+ * keys('hi'); // ['0', '1']
+ * keys([1, 2, 3]); // ['0', '1', '2']
+ * keys({ a: 1, b: 2 }); // ['a', 'b']
+ */
+declare function keys(object?: any): string[];
+//#endregion
+export { keys };