refactor: reorganize project structure by migrating engine and geometry utilities into a structured map directory

src/uhm/lib/utils/id.ts

@@ -0,0 +1,8 @@
+import { v7 as uuidv7 } from "uuid";
+
+// Centralized ID generator for all client-created identifiers in FrontEndUser.
+// UUIDv7 is time-ordered (RFC 9562) and works well for sorting by creation time.
+export function newId(): string {
+  return uuidv7();
+}
+