fix: authorization

fix: add Librarian approval for pay in cash, balance update loading time fix, membership approval page added

add: user balance

add: small fixes, UI designing

add: blazor web assembly.

add: change userid to guid and small fixes

add: Queued membership

add: reward system

add: membership view

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