Add biometric auth, ntfy push notifications, mobile improvements
Mobile:
- Add biometric authentication (Face ID/Touch ID/fingerprint) on app launch
with PIN/password fallback, auto-prompts on launch, skip option
- Add @aparajita/capacitor-biometric-auth plugin
Backend:
- Add ntfy push notification support (src/utils/notify.js)
Self-hosted, no Firebase dependency, uses user's existing ntfy instance
- Notifications for: new login, password changed, new registration (admin)
- Topic format: pedscribe-user-{id} for users, pedscribe-admin for admins
- Env: NTFY_URL, NTFY_TOKEN (optional)
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