- Add FielUploadModal component for FIEL credential upload
- Add SyncStatus component showing current sync progress
- Add SyncHistory component with pagination and retry
- Add SAT configuration page at /configuracion/sat
- Add API client functions for FIEL and SAT endpoints
Features:
- File upload with Base64 encoding
- Real-time sync progress tracking
- Manual sync trigger (initial/daily)
- Sync history with retry capability
- FIEL status display with expiration warning
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
