feat(user): add local avatar management flow

assets/admin/src/schema/sections/global/common.js

@@ -2,7 +2,7 @@ export const commonSchema = {
   key: 'global.common',
   title: '常用功能',
   icon: 'fas fa-cog',
-  description: '管理站点常用开关、懒加载、头像源与备案信息等基础配置。',
+  description: '管理站点常用开关、懒加载与备案信息等基础配置。',
   defaults: {
     comment_enabled: true,
     lazyload_enabled: true,
@@ -17,7 +17,6 @@ export const commonSchema = {
     lazyload_cover: true,
     lazyload_other: true,
     lazyload_widget: true,
-    avatar_source: 'cn.cravatar.com',
     icp_filing: '',
     footer_text: '',
   },
@@ -67,25 +66,6 @@ export const commonSchema = {
         { key: 'lazyload_widget', label: '小工具图片懒加载', type: 'switch', default: true, dependsOn: { key: 'lazyload_enabled', value: true } },
       ],
     },
-    {
-      key: 'avatar',
-      title: '头像服务',
-      icon: 'fas fa-user-circle',
-      fields: [
-        {
-          key: 'avatar_source',
-          label: '头像源',
-          type: 'select',
-          default: 'cn.cravatar.com',
-          options: [
-            { label: 'Cravatar (推荐)', value: 'cn.cravatar.com' },
-            { label: 'Gravatar 中国', value: 'cn.gravatar.com' },
-            { label: 'Gravatar 国际', value: 'gravatar.com' },
-          ],
-          help: 'Cravatar 是国内最快的头像服务，推荐使用',
-        },
-      ],
-    },
     {
       key: 'filing',
       title: '备案信息',