diff --git a/internal/biz/admin.go b/internal/biz/admin.go
deleted file mode 100644
index 7770477..0000000
--- a/internal/biz/admin.go
+++ /dev/null
@@ -1,105 +0,0 @@
-package biz
-
-import (
-	"context"
-	"time"
-
-	"github.com/go-kratos/kratos/v2/errors"
-	"github.com/go-kratos/kratos/v2/log"
-)
-
-// Admin is a Admin model.
-type Admin struct {
-	ID         int64
-	Name       string
-	Email      string
-	Password   string
-	Access     string
-	Avatar     string
-	CreateTime time.Time
-	UpdateTime time.Time
-}
-
-// AdminRepo is a Greater repo.
-type AdminRepo interface {
-	FindByID(context.Context, int64) (*Admin, error)
-	FindByName(context.Context, string) (*Admin, error)
-	FindByEmail(context.Context, string) (*Admin, error)
-	ListAdmins(context.Context, ...ListOption) ([]*Admin, error)
-	CreateAdmin(context.Context, *Admin) (*Admin, error)
-	UpdateAdmin(context.Context, *Admin) (*Admin, error)
-	DeleteAdmin(context.Context, int64) error
-}
-
-// AdminUsecase is a Admin usecase.
-type AdminUsecase struct {
-	admin AdminRepo
-}
-
-// NewAdminUsecase new a Admin usecase.
-func NewAdminUsecase(repo AdminRepo) *AdminUsecase {
-	return &AdminUsecase{admin: repo}
-}
-
-// LoginByUsername logs in a user by username and password.
-func (uc *AdminUsecase) LoginByUsername(ctx context.Context, username, password string) (*Admin, error) {
-	user, err := uc.admin.FindByName(ctx, username)
-	if err != nil {
-		return nil, err
-	}
-	if user.Password != password {
-		return nil, errors.Unauthorized("AUTH", "invalid credentials")
-	}
-	return user, nil
-}
-
-// LoginByEmail logs in a user by email and password.
-func (uc *AdminUsecase) LoginByEmail(ctx context.Context, username, password string) (*Admin, error) {
-	user, err := uc.admin.FindByEmail(ctx, username)
-	if err != nil {
-		return nil, err
-	}
-	if user.Password != password {
-		return nil, errors.Unauthorized("AUTH", "invalid credentials")
-	}
-	return user, nil
-}
-
-// Logout logs out the current user.
-func (uc *AdminUsecase) Logout(ctx context.Context, adminID int64) error {
-	admin, err := uc.admin.FindByID(ctx, adminID)
-	if err != nil {
-		return err
-	}
-	log.Infof("admin %s logged out", admin.Name)
-	return nil
-}
-
-// Current returns the current logged in user.
-func (uc *AdminUsecase) GetAdmin(ctx context.Context, id int64) (*Admin, error) {
-	return uc.admin.FindByID(ctx, id)
-}
-
-// ListAdmins lists admin users with pagination.
-func (uc *AdminUsecase) ListAdmins(ctx context.Context, opts ...ListOption) ([]*Admin, error) {
-	admins, err := uc.admin.ListAdmins(ctx, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return admins, nil
-}
-
-// CreateAdmin creates a new admin user.
-func (uc *AdminUsecase) CreateAdmin(ctx context.Context, admin *Admin) (*Admin, error) {
-	return uc.admin.CreateAdmin(ctx, admin)
-}
-
-// UpdateAdmin updates an existing admin user.
-func (uc *AdminUsecase) UpdateAdmin(ctx context.Context, admin *Admin) (*Admin, error) {
-	return uc.admin.UpdateAdmin(ctx, admin)
-}
-
-// DeleteAdmin deletes an admin user by ID.
-func (uc *AdminUsecase) DeleteAdmin(ctx context.Context, id int64) error {
-	return uc.admin.DeleteAdmin(ctx, id)
-}