feat: add session authorization mode configuration (#446)

Add approvals.mode configuration to allow users to enable/disable
session operation authorization. Mode can be 'off' (no auth) or 'manual'
(require auth). Changes trigger automatic gateway restart for config
to take effect.

- Add ApprovalConfig type with mode: 'off' | 'manual'
- Add approvals section to settings store
- Add session authorization toggle in SessionSettings UI
- Add approvals to PLATFORM_SECTIONS for auto-restart
- Add i18n support for all 8 languages

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/client/src/i18n/locales/zh.ts

@@ -518,6 +518,8 @@ export default {
       liveMonitorHumanOnly: '实时监看：仅显示人类会话',
       liveMonitorHumanOnlyHint: '在实时监看中默认隐藏子代理和会话监看噪音',
       atHourHint: '每天在指定小时重置会话',
+      requireAuth: '会话授权',
+      requireAuthHint: '修改会话操作是否授权',
     },
     privacy: {
       redactPii: '脱敏 PII',