feat(ui06): B3d governance + B3e closing — page headings, stat cards, info strip, embed slots

- 治理页通用层（ui06.scss）：.ui06-page 工作区 / .ui06-page-heading 27px 页头 / .ui06-stats
  三列统计卡 / .ui06-info-strip 提示条 / .ui06-card-title 17px 卡头
- 10 账号：页头（查看同步入口）+ 来源提示条；分页/同步档案列/G4 功能零改动
- 11 同步：页头（手动补拉上移）；状态卡/历史/失败明细抽屉保留
- 12 用量：页头（阈值设置上移）+ 统计卡对齐示例（数字 27px + 注脚 10px）
- 13 展示位：页头 + 卡片标题（配置对话框沿用 UI-04 真实组件）
- 17-19 异常页：沿用 ArtException（大数字+文案+回退，语义等同示例；登记偏差）
- i18n zh/en；typecheck/lint/vitest/build 全绿

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

apps/admin/src/locales/langs/zh.json

@@ -586,7 +586,10 @@
     "totals": {
       "photoCount": "照片总数",
       "totalBytes": "存储总量",
-      "thresholds": "告警阈值"
+      "thresholds": "告警阈值",
+      "photoCountNote": "用量接口汇总",
+      "totalBytesNote": "原图 + 浏览变体",
+      "thresholdsNote": "告警阈值，并非存储硬配额"
     },
     "albums": {
       "title": "相册用量",
@@ -621,6 +624,10 @@
       "kind_storage": "全库存储",
       "kind_perAlbum": "单相册",
       "empty": "暂无告警"
+    },
+    "page": {
+      "title": "存储与用量",
+      "subtitle": "查看长期保留的照片资产与告警阈值。"
     }
   },
   "usersManage": {
@@ -649,7 +656,11 @@
       "actionResetPassword": "重置密码",
       "actionActivate": "激活",
       "actionDeactivate": "停用",
-      "actionUnlock": "解锁"
+      "actionUnlock": "解锁",
+      "subtitle": "统一查看企业来源状态、登录凭据与本地账号治理。",
+      "viewSync": "查看用户同步",
+      "tableTitle": "账号列表",
+      "sourceHint": "用户信息来自企业接口定期拉取，不开放注册；来源状态与本地锁定相互独立。"
     },
     "filter": {
       "queryPlaceholder": "账号/姓名前缀",
@@ -770,6 +781,10 @@
       "colCode": "分类码",
       "colDetail": "详情",
       "colCreatedAt": "记录时间"
+    },
+    "page": {
+      "title": "用户同步",
+      "subtitle": "查看企业用户接口的定时拉取结果，定位失败记录。"
     }
   },
   "embedSlotsManage": {
@@ -790,7 +805,9 @@
       "unbound": "未绑定",
       "actionEdit": "编辑",
       "actionBind": "绑定相册",
-      "actionCode": "嵌入代码"
+      "actionCode": "嵌入代码",
+      "subtitle": "管理官网悬浮照片展示位：绑定相册、启停与接入代码。",
+      "tableTitle": "展示位列表"
     },
     "form": {
       "nameLabel": "名称",