refactor: remove username from User model, login by email only

tests/unit/i18n/admin-users-dictionary.test.ts

@@ -12,7 +12,6 @@ describe("admin users dictionary", () => {
       empty: "No users found.",
       columns: {
         name: "Name",
-        username: "Username",
         email: "Email",
         role: "Role",
         status: "Status",
@@ -29,8 +28,6 @@ describe("admin users dictionary", () => {
     expect(users.form).toEqual({
       nameLabel: "Name",
       namePlaceholder: "Full name",
-      usernameLabel: "Username",
-      usernamePlaceholder: "Username",
       emailLabel: "Email",
       emailPlaceholder: "user@example.com",
       passwordLabel: "Password",
@@ -69,7 +66,6 @@ describe("admin users dictionary", () => {
       toggleStatusFailure: "Failed to update user status",
       resetPasswordSuccess: "Password reset successfully",
       resetPasswordFailure: "Failed to reset password",
-      duplicateUsername: "Username already exists",
       duplicateEmail: "Email already exists",
       notFound: "User not found",
       lastActiveAdmin:
@@ -79,7 +75,6 @@ describe("admin users dictionary", () => {
     })
 
     expect(users.schema).toEqual({
-      usernameRequired: "Username is required",
       nameRequired: "Name is required",
       emailInvalid: "Invalid email",
       passwordMinLength: "Password must be at least 8 characters",
@@ -100,7 +95,6 @@ describe("admin users dictionary", () => {
       empty: "No se encontraron usuarios.",
       columns: {
         name: "Nombre",
-        username: "Usuario",
         email: "Correo electrónico",
         role: "Rol",
         status: "Estado",
@@ -117,8 +111,6 @@ describe("admin users dictionary", () => {
     expect(users.form).toEqual({
       nameLabel: "Nombre",
       namePlaceholder: "Nombre completo",
-      usernameLabel: "Usuario",
-      usernamePlaceholder: "Usuario",
       emailLabel: "Correo electrónico",
       emailPlaceholder: "usuario@ejemplo.com",
       passwordLabel: "Contraseña",
@@ -157,7 +149,6 @@ describe("admin users dictionary", () => {
       toggleStatusFailure: "Error al actualizar el estado del usuario",
       resetPasswordSuccess: "Contraseña restablecida correctamente",
       resetPasswordFailure: "Error al restablecer la contraseña",
-      duplicateUsername: "El nombre de usuario ya existe",
       duplicateEmail: "El correo electrónico ya existe",
       notFound: "Usuario no encontrado",
       lastActiveAdmin:
@@ -167,7 +158,6 @@ describe("admin users dictionary", () => {
     })
 
     expect(users.schema).toEqual({
-      usernameRequired: "El usuario es obligatorio",
       nameRequired: "El nombre es obligatorio",
       emailInvalid: "Correo electrónico no válido",
       passwordMinLength: "La contraseña debe tener al menos 8 caracteres",