Generate asset versions during Docker builds

public/js/lot-picker.js

@@ -1,5 +1,5 @@
-import { api, protectedFetch } from "./api.js?v=20260730-release2";
-import { showToast } from "./toast.js?v=20260730-release2";
+import { api, protectedFetch } from "./api.js?v=__ASSET_VERSION__";
+import { showToast } from "./toast.js?v=__ASSET_VERSION__";
 
 let lots = [];