Refactor db and local-cache code

Separated cwmp and ui code into distinct files to enhance clarity and
maintainability with varied internal data representations.

bin/genieacs-cwmp.ts

@@ -22,7 +22,7 @@ import * as logger from "../lib/logger";
 import * as cluster from "../lib/cluster";
 import * as server from "../lib/server";
 import * as cwmp from "../lib/cwmp";
-import * as db from "../lib/db";
+import * as db from "../lib/db/db";
 import * as extensions from "../lib/extensions";
 import { version as VERSION } from "../package.json";