marzban_api

bump version to 0.2.8 in Cargo.toml

feat: add optional fields to UserCreate and UserModify structs for enhanced serialization flexibility

bump version to 0.2.7 in Cargo.toml

feat: make user model fields optional for improved flexibility in serialization

bump version to 0.2.6 in Cargo.toml, README, and lib.rs; update user model fields to be optional for improved flexibility