feat: Passkey (WebAuthn) login (#1111)

* feat(auth): passkey (WebAuthn) login — server endpoints, schema + admin toggle

Add @simplewebauthn/server registration and primary (discoverable) login ceremonies under /api/auth/passkey, a webauthn_credentials + single-use webauthn_challenges schema (migration), the instance-wide passkey_login toggle (default off) enforced before auth by a guard, and require_mfa satisfaction via a verified passkey. RP ID/origin come only from server config (webauthn_rp_id/origins -> APP_URL), never request headers.

* feat(auth): passkey enrolment, login button + admin settings UI

PasskeysSection in account settings (add/rename/remove with a current-password step-up), a 'Sign in with a passkey' button on the login page, the admin enable + RP-ID/origins controls, and a per-user admin reset action.

* i18n(auth): passkey strings across all locales

Add login/settings/admin passkey keys to en and all 19 translated locales.

shared/src/i18n/zh/settings.ts

@@ -283,6 +283,28 @@ const settings: TranslationStrings = {
   'settings.notificationPreferences.ntfy': 'Ntfy',
   "settings.currency": "Currency",
   "settings.currencyHint": "All amounts in Costs are converted to and shown in this currency.",
+  'settings.passkey.title': '通行密钥',
+  'settings.passkey.description':
+    '使用通行密钥更快登录，并能抵御钓鱼攻击——通过指纹、面容、PIN 或硬件密钥验证。你的密码仍可作为备用方式。',
+  'settings.passkey.notConfigured':
+    '通行密钥已启用，但此服务器尚未完成完整配置。请联系管理员设置 WebAuthn 域名。',
+  'settings.passkey.add': '添加通行密钥',
+  'settings.passkey.addTitle': '添加通行密钥',
+  'settings.passkey.passwordPrompt': '确认你的当前密码，然后按照设备提示操作。',
+  'settings.passkey.passwordRequired': '需要输入你的当前密码。',
+  'settings.passkey.namePlaceholder': '名称（可选，如 "iPhone"）',
+  'settings.passkey.addedToast': '通行密钥已添加',
+  'settings.passkey.added': '已添加',
+  'settings.passkey.addError': '无法添加通行密钥',
+  'settings.passkey.cancelled': '已取消通行密钥设置',
+  'settings.passkey.deleted': '通行密钥已移除',
+  'settings.passkey.deleteConfirm': '移除此通行密钥？请输入密码确认。',
+  'settings.passkey.rename': '重命名',
+  'settings.passkey.defaultName': '通行密钥',
+  'settings.passkey.synced': '已同步',
+  'settings.passkey.deviceBound': '此设备',
+  'settings.passkey.lastUsed': '上次使用',
+  'settings.passkey.neverUsed': '从未使用',
 };
 
 export default settings;