add: authorized pages, firebase

add: books, borrowings, home, login, membership, register, reward, userinsights, wishlist, themes

add: blazor web assembly.

add: removed firebase json file

add: book cover fix

add: books crud, borrowing workflow, member crud, rewards page

add: points history

add: change userid to guid and small fixes

add: book categories and filter

add: return rule

add: Queued membership

add: reward system

add: membership view

add: some features

add: subscription rewards, register rewards, fix some features

add: loyalty reward system

feat: restructure backend project, add configuration files, implement authentication, user and book management, and enhance borrowing and subscription features