Add upload email notifications with Seafile direct-upload watcher; v2.0.6

- Portal uploads send one email immediately (host, episode, passage,
  description, filenames) via Resend to NUGGETS_NOTIFY_EMAIL
- Seafile watcher polls /Episode Upload every 15 min for direct uploads
  and sends a notification for any new file not already seen via portal
- Files uploaded through the portal are marked seen so the watcher
  never sends a duplicate notification
- Credentials kept out of git: SEAFILE_TOKEN, SEAFILE_NUGGETS_REPO_ID,
  NUGGETS_NOTIFY_EMAIL now sourced from docker .env file

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/config.js

@@ -59,6 +59,11 @@ export const QR_CODES_FILE = path.join(DATA_DIR, 'qr-codes.json')
 export const EPISODE_PLAYS_FILE = path.join(DATA_DIR, 'episode-plays.json')
 export const ANALYTICS_EVENTS_FILE = path.join(DATA_DIR, 'analytics-events.json')
 export const NUGGETS_UPLOAD_HOSTS_FILE = path.join(DATA_DIR, 'nuggets-upload-hosts.json')
+export const NUGGETS_SEAFILE_SEEN_FILE = path.join(DATA_DIR, 'nuggets-seafile-seen.json')
+
+// Email address for Nuggets upload notifications (defaults to the admin inbox)
+export const NUGGETS_NOTIFY_EMAIL = process.env.NUGGETS_NOTIFY_EMAIL ?? process.env.RESEND_TO ?? 'hello@versebyversewithnate.us'
+export const SEAFILE_POLL_INTERVAL_MS = 15 * 60 * 1000 // 15 minutes
 export const EMAIL_SETTINGS_FILE = path.join(DATA_DIR, 'email-settings.json')
 export const CALENDAR_EVENTS_FILE = path.join(DATA_DIR, 'calendar-events.json')
 export const AUDIT_LOG_FILE = path.join(DATA_DIR, 'audit-log.json')