chore: remove LibraryManagement.Frontend project reference from solution

feat: implement authentication and authorization features, add book and user management controllers, and enhance UI for login and registration

feat: update book and user models, enhance subscription management with admin features, and modify connection string

chore: remove frontend project files and configuration

feat: add database schema and seed data for Library Management System

add mvc

add: frontend

add feat: swagger

feat: add user management, book management, categories management, membership management, and borrowing management

feat: authorization

Add project files.

Add .gitattributes, .gitignore, and README.md.