feat(users): govern profiles and access

Normalize fixed profile fields, profile actions, and the five-column capability matrix for comments, uploads, and downloads.

src/Admin/Schema/SchemaUsers.php

@@ -602,8 +602,6 @@ class SchemaUsers {
                     'groups'     => [
                         ['key' => 'center', 'title' => '用户中心', 'fields' => [
                             ['key' => 'user_center_tabs', 'label' => '用户中心 Tab', 'type' => 'input', 'default' => 'profile,level,comments,favorites,vip,credits,revenue,auth', 'help' => '逗号分隔。level=我的等级；creator=创作中心；revenue=推广收益中心；auth=官方认证；等级、VIP、订单、创作中心、收益中心和认证会按功能开关自动注入'],
-                            ['key' => 'user_cover_upload', 'label' => '封面上传', 'type' => 'switch', 'default' => true],
-                            ['key' => 'user_social_links', 'label' => '社交链接', 'type' => 'switch', 'default' => true],
                             ['key' => 'user_desc_std', 'label' => '默认签名', 'type' => 'input', 'default' => '这家伙很懒…', 'desc' => '用户未设置个人简介时显示的默认文案'],
                             ['key' => 'user_city_s', 'label' => '显示城市（IP 归属地）', 'type' => 'switch', 'default' => true],
                             ['key' => 'user_city_type', 'label' => '位置精度', 'type' => 'radio', 'default' => 'province', 'options' => [