feat: Library 批量注册 + PeopleView 修复 + 国际化

Library:
- 添加 checkbox 和鼠标框选功能
- Unregistered 卡片添加快速注册按钮
- 状态标签移至左下方，人脸图标移至左侧中间
- Deep Scan 改为 unregister -> register -> process
- 完整国际化（日语、繁体中文、英语）

PeopleView:
- 修复卡片不显示问题（使用 get_file_traces API）
- 移除对 identity_id 字段的依赖

其他:
- 添加日语语言包
- 添加 useDragSelect composable
- 新增文档：Face Bbox Null Bug Report

src/composables/useUndoRedo.ts

@@ -1,4 +1,5 @@
 import { reactive } from 'vue'
+import { useI18n } from 'vue-i18n'
 import { apiCall } from '@/api'
 import { invalidatePeople, ensurePeople } from '@/store'
 
@@ -29,6 +30,7 @@ interface ActionHistoryItem {
 }
 
 export function useUndoRedo() {
+  const { t } = useI18n()
   const counts = reactive<Record<string, HistoryCounts>>({})
   const mergeHistory = reactive<MergeHistoryItem[]>([])
   const recentActions = reactive<ActionHistoryItem[]>([])
@@ -82,7 +84,7 @@ export function useUndoRedo() {
       const patchItems = patchHist?.history || patchHist?.records || []
       for (const r of Array.isArray(patchItems) ? patchItems : []) {
         const op = r.operation ?? r.op ?? ''
-        const label = op === 'delete' ? '刪除人物' : op === 'update' ? '更新人物' : op
+        const label = op === 'delete' ? t('people.action.delete_person') : op === 'update' ? t('people.action.update_person') : op
         actions.push({
           type: op === 'delete' ? 'delete' : 'patch',
           label,
@@ -95,7 +97,7 @@ export function useUndoRedo() {
       const bindItems = bindHist?.history || bindHist?.records || []
       for (const r of Array.isArray(bindItems) ? bindItems : []) {
         const op = r.operation ?? r.op ?? ''
-        const label = op === 'bind' ? '綁定面部' : op === 'unbind' ? '解綁面部' : op === 'bind_trace' ? '綁定軌跡' : op
+        const label = op === 'bind' ? t('people.action.bind_face') : op === 'unbind' ? t('people.action.unbind_face') : op === 'bind_trace' ? t('people.action.bind_trace') : op
         actions.push({
           type: 'bind',
           label,