fix(user): 移除邮箱字段必填验证

- 移除了邮箱字段的 required 验证规则
- 用户可以不填写邮箱直接提交表单

xjrsoft-vue3/src/views/system/user/components/UserModal.vue

@@ -200,7 +200,6 @@
       label: t('邮箱'),
       label: t('邮箱'),
       field: 'email',
       field: 'email',
       component: 'Input',
       component: 'Input',
-      required: true,
       colProps: { span: 12 },
       colProps: { span: 12 },
       componentProps: {
       componentProps: {
         placeholder: '请输入邮箱',
         placeholder: '请输入邮箱',