feat: Duo Security integration — full data sync from Accounts + Admin API

Duo API Client (lib/services/duo-client.ts):
- HMAC-SHA1 request signing, GET/POST, automatic pagination
- Rate-limit handling (429 + Retry-After), configurable timeout
- Accounts API: listAccounts() via POST /accounts/v1/account/list
- Admin API: getUsers, getPhones, getGroups, getIntegrations, getAuthLogs
- Child account access: parent creds signed against child api_hostname + account_id
- Factory helpers: getDuoAccountsClient(), getDuoAdminClient()

Database (migration 058):
- 6 tables: duo_accounts, duo_users, duo_phones, duo_auth_logs, duo_groups, duo_integrations
- All with proper FKs, indexes, JSONB fields for capabilities/location/groups

Sync Service (lib/services/duo-sync-service.ts):
- syncAll(): accounts → per-child data + auth logs → parent account → company matching
- Sequential child processing to respect rate limits
- Incremental auth logs (mintime = last synced timestamp, default 30 days)
- Company matching: exact → case-insensitive containment (30/32 = 94% matched)
- Non-blocking with sync ID tracking

API Routes:
- POST/GET /api/duo/sync — trigger sync / check status
- GET /api/duo/accounts — list all accounts with stats + matched company
- GET /api/duo/accounts/[id]/users — users for a specific account
- POST /api/openclaw/sync/duo — OpenClaw trigger with API key auth

Results: 33 accounts, 832 users, 925 phones, 5927 auth logs, 46 groups, 78 integrations

middleware.ts

@@ -35,6 +35,8 @@ const publicRoutes = [
   "/api/qbo/sync",
   "/api/reports/ticket-digest",
   "/api/notifications/morning-summary/send",
+  // Duo Security sync and data endpoints
+  "/api/duo",
 ];
 
 // Routes that require admin or super-admin role