feat(nav): deep-align menu_search panel, pill radius, senior media

- Layout-2 remote-box AJAX panel (history/hot/posts) via aksrt_menu_search
- Live suggestions for post/topic/product; local history for guests
- Publish radius switch (zibll bool pill) mapped to CSS radius class
- Senior menu editor: WP media library image picker
- Active menu underline + panel CSS; acceptance/contract updates

assets/admin/src/schema/sections/page-display/index.js

@@ -51,7 +51,7 @@ export const pageDisplaySchemas = {
       mobile_navbar_align: 'left',
       header_newposts_enabled: true,
       header_newposts_text: '<i class="fa fa-pencil"></i> 发布',
-      header_newposts_radius: 20,
+      header_newposts_radius: true,
       header_newposts_class: '',
       header_theme_custom: false,
       header_theme_bg_custom: '',
@@ -126,7 +126,7 @@ export const pageDisplaySchemas = {
         fields: [
           { key: 'header_newposts_enabled', label: '启用发布按钮', type: 'switch', default: true, help: '导航栏显示前台发布入口' },
           { key: 'header_newposts_text', label: '按钮文案', type: 'input', default: '<i class="fa fa-pencil"></i> 发布', dependsOn: { key: 'header_newposts_enabled', value: true } },
-          { key: 'header_newposts_radius', label: '圆角 (px)', type: 'number', default: 20, min: 0, max: 30, dependsOn: { key: 'header_newposts_enabled', value: true } },
+          { key: 'header_newposts_radius', label: '按钮圆角（胶囊）', type: 'switch', default: true, dependsOn: { key: 'header_newposts_enabled', value: true }, help: '开启后两端大圆角，对齐 zibll nav_newposts_radius' },
           { key: 'header_newposts_class', label: '自定义 CSS 类', type: 'input', default: '', dependsOn: { key: 'header_newposts_enabled', value: true } },
           { key: 'header_newposts_types', label: '发布类型', type: 'select', multiple: true, default: ['post'], options: [
             { label: '文章', value: 'post' },