refactor: remove test for app.component

refactor: improve DbContext reassignment safety and formatting

refactor: update package-lock

refactor: update import paths to use cms-extensions

refactor: move models and code that relates to data into packages (core)

refactor: delete the examples folder and its associated settings

refactor: Separate classes with data

refactor: move IApplicationDbContext to the folder "Data"

refactor: change namespace of IJsonFileService for the general structure

Add tests for services

Add file existence check

Update tests for the NUnit and fix the logic of working with the database

Add IApplicationDbContext

Registrate interface IApplicationDbContext

refactor: update tests for angular19

refactor: Update service name

refactor: Update throwError for angular19

refactor: Comment unworking test

refactor: Switch to the new template syntax(@for and @if)

remove .vscode

remove .vscode

remove node modules

update: update Angular to v19