refactor(settings): remove filing info config and readers

Drop the 备案信息 group (icp_filing, police_filing, footer_text) from the
global.common PHP/Vue schemas, the FacadeBulk readers and the
get_global_settings() payload. No frontend consumer existed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/src/constants/sections/global.js

@@ -12,7 +12,7 @@ export const globalSection = {
       label: '常用功能',
       route: '/global/common',
       title: '常用功能',
-      desc: '评论、性能、头像源与备案等全局基础配置。',
+      desc: '评论、性能、头像源等全局基础配置。',
       canonicalDomain: 'global',
       section: 'common',
     }),

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

@@ -7,7 +7,7 @@ export const commonSchema = {
   key: 'global.common',
   title: '常用功能',
   icon: 'fa fas fa-cog',
-  description: '管理站点常用开关、懒加载与备案信息等基础配置。',
+  description: '管理站点图像懒加载等常用基础配置。',
   defaults: {
     lazy_posts_thumb: true,
     lazy_avatar: true,
@@ -18,9 +18,6 @@ export const commonSchema = {
     lazy_other: true,
     lazy_animation: 'blur',
     thumbnail: defaultThumbnail,
-    icp_filing: '',
-    police_filing: '',
-    footer_text: '',
   },
   groups: [
     {
@@ -56,15 +53,5 @@ export const commonSchema = {
         { key: 'lazy_other', label: '其它图片懒加载', type: 'switch', default: true },
       ],
     },
-    {
-      key: 'filing',
-      title: '备案信息',
-      icon: 'fa fas fa-shield-alt',
-      fields: [
-        { key: 'icp_filing', label: 'ICP 备案号', type: 'input', placeholder: '例如：京ICP备12345678号', help: '显示在页脚的备案信息' },
-        { key: 'police_filing', label: '公安备案号', type: 'input', placeholder: '例如：公网安备11000000000000号', help: '显示在页脚的备案信息' },
-        { key: 'footer_text', label: '页脚附加文字', type: 'input', placeholder: '自定义页脚文字', help: '显示在版权信息下方' },
-      ],
-    },
   ],
 }