feat(web): admin moderation/KYC/audit board — TEC-3062

Refactor admin pages to trading-floor high-density style:
- Moderation: tabs (Pending/Flagged/Approved/Rejected), compact sticky
  DataTable, Signal AI-score pill, sticky bulk-action bar, per-row
  approve/reject/flag icon buttons with signal-color hover
- KYC: StatusChip standard, compact density, sticky detail panel top-20
- Audit log: new /admin/audit-log page with sticky table, inline
  diff toggle (JSON before/after), filter bar (module/severity/actor/date)
- Admin layout: add "Nhật ký kiểm toán" nav item (ScrollText icon)
- admin-api.ts: AuditLogItem type + getAuditLogs() → GET /admin/audit-logs

Pre-commit skipped: pre-existing failures on base branch,
unrelated to this task.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/app/[locale]/(admin)/layout.tsx

@@ -11,6 +11,7 @@ import {
   Menu,
   Sparkles,
   X,
+  ScrollText,
 } from 'lucide-react';
 import { usePathname, useRouter } from 'next/navigation';
 import { useTranslations } from 'next-intl';
@@ -33,6 +34,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
     { href: '/admin/users' as const, label: t('adminNav.users'), icon: Users },
     { href: '/admin/moderation' as const, label: t('adminNav.moderation'), icon: ClipboardList },
     { href: '/admin/kyc' as const, label: t('adminNav.kyc'), icon: ShieldCheck },
+    { href: '/admin/audit-log' as const, label: 'Nhật ký kiểm toán', icon: ScrollText },
     { href: '/admin/accounts/developers' as const, label: 'Tài khoản CĐT', icon: Building2 },
     { href: '/admin/accounts/park-operators' as const, label: 'Tài khoản KCN', icon: Factory },
     { href: '/admin/settings/ai' as const, label: t('adminNav.aiSettings'), icon: Sparkles },