Refactor db and local-cache code

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

.eslintrc.json

@@ -21,7 +21,6 @@
     "no-buffer-constructor": "error",
     "prefer-const": ["error", { "destructuring": "all" }],
     "eqeqeq": ["error", "always", { "null": "ignore" }],
-    "no-return-await": "error",
     "@typescript-eslint/no-explicit-any": 0,
     "@typescript-eslint/no-use-before-define": [
       "error",