feat(shared): add UI components, hooks, form fields, and action utils

- Add UI components: confirm-delete-dialog, empty-table-row, list-pagination, pagination, status-badge

- Add form-fields directory for reusable form field components

- Add hooks: use-action-mutation, use-action-query for server action integration

- Add action-utils lib for action state helpers

- Update a11y components, charts, global-search, onboarding-gate, question components

- Update UI components: chip-nav, filter-bar, page-header, stat-card, stat-item, switch, table

- Update hooks: use-action-with-toast, use-aria-live, use-debounce, use-local-storage, use-media-query, use-permission

- Update lib: a11y, ai, audit-logger, auth-guard, bcrypt-utils, change-logger, download, excel, file-storage, http-utils, login-logger, password-policy, password-security-service, permissions, rate-limit, role-utils, search-params, session, storage-provider

- Update types: action-state, permissions

- Update i18n messages (en, zh-CN) for dashboard, diagnostic, grades, lesson-preparation, settings

src/shared/i18n/messages/zh-CN/settings.json

@@ -11,6 +11,18 @@
   "profile": {
     "title": "个人信息",
     "description": "更新您的个人资料。",
+    "avatar": {
+      "upload": "上传头像",
+      "remove": "移除",
+      "hint": "支持 JPG、PNG、WebP、GIF，最大 2MB",
+      "uploadSuccess": "头像更新成功",
+      "uploadFailure": "头像上传失败",
+      "removeSuccess": "头像已移除",
+      "removeFailure": "移除头像失败",
+      "invalidType": "仅支持 JPG、PNG、WebP、GIF 格式",
+      "tooLarge": "文件大小不能超过 2MB",
+      "tooLongName": "文件名过长，请重命名后再上传（最多 255 字符）"
+    },
     "fields": {
       "name": "姓名",
       "namePlaceholder": "您的姓名",
@@ -68,7 +80,10 @@
     "save": "保存偏好",
     "saving": "保存中...",
     "success": "通知偏好已更新",
-    "failure": "通知偏好更新失败"
+    "failure": "通知偏好更新失败",
+    "test": "测试",
+    "testSuccess": "测试通知已发送",
+    "testFailure": "测试通知发送失败"
   },
   "appearance": {
     "theme": {
@@ -120,6 +135,63 @@
       "tip2": "避免使用常见词汇、姓名或连续模式。",
       "tip3": "定期更换密码。",
       "tip4": "多次登录失败后账户将被临时锁定。"
+    },
+    "center": {
+      "title": "安全中心",
+      "description": "管理两步验证和查看登录活动。",
+      "twoFactor": {
+        "title": "两步验证（2FA）",
+        "description": "启用后，登录时需要输入手机验证器生成的一次性码。",
+        "enabled": "已启用",
+        "hint": "启用 2FA 可显著提升账户安全性，防止密码泄露导致的未授权访问。",
+        "enable": "启用",
+        "disable": "关闭",
+        "enableSuccess": "两步验证已启用",
+        "disableSuccess": "两步验证已关闭",
+        "toggleFailure": "操作失败，请稍后重试",
+        "setupFailure": "生成二维码失败，请稍后重试",
+        "verifyFailure": "验证失败，请稍后重试",
+        "disableFailure": "关闭失败，请稍后重试",
+        "regenerateFailure": "重新生成备份码失败，请稍后重试",
+        "regenerateSuccess": "备份码已重新生成",
+        "invalidCode": "验证码无效，请重新输入",
+        "scanQr": "使用验证器 App（如 Google Authenticator、Microsoft Authenticator）扫描上方二维码",
+        "manualEntry": "无法扫码？手动输入此密钥",
+        "enterCode": "输入验证器显示的 6 位数字",
+        "enterCodeDisable": "输入一次性码或备份码以确认关闭 2FA",
+        "enterCodeRegen": "输入当前的一次性码以重新生成备份码",
+        "verify": "验证并启用",
+        "cancel": "取消",
+        "done": "完成",
+        "backupCodes": "备份码",
+        "backupHint": "无法访问验证器时用于恢复账户",
+        "backupRemaining": "剩余 {count} 个备份码",
+        "backupWarning": "请妥善保存这些备份码。每个备份码只能使用一次。丢失后无法找回，只能重新生成。",
+        "copy": "复制全部",
+        "copied": "已复制",
+        "regenerate": "重新生成",
+        "disableTitle": "关闭两步验证",
+        "disableDescription": "关闭后，登录将不再需要一次性码。为确认是本人操作，请输入当前的一次性码或备份码。",
+        "regenerateTitle": "重新生成备份码",
+        "regenerateDescription": "此操作将使所有旧备份码失效，并生成 10 个新备份码。请输入当前的一次性码以确认。"
+      },
+      "recentLogins": {
+        "title": "最近登录",
+        "showingLatest": "最近 {count} 条记录",
+        "empty": "暂无登录记录",
+        "failed": "失败",
+        "current": "当前会话",
+        "revokeAll": "登出所有其他会话",
+        "revoking": "处理中...",
+        "revokeSuccess": "已登出 {count} 个会话",
+        "revokeSuccessEmpty": "无其他活跃会话需要登出",
+        "revokeFailure": "登出会话失败，请稍后重试",
+        "actions": {
+          "signin": "登录",
+          "signout": "退出",
+          "signup": "注册"
+        }
+      }
     }
   },
   "ai": {