feat(sat): add frontend components for SAT configuration (Phase 8)

- 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>

apps/web/lib/api/fiel.ts

@@ -0,0 +1,16 @@
+import { apiClient } from './client';
+import type { FielStatus, FielUploadRequest } from '@horux/shared';
+
+export async function uploadFiel(data: FielUploadRequest): Promise<{ message: string; status: FielStatus }> {
+  const response = await apiClient.post('/fiel/upload', data);
+  return response.data;
+}
+
+export async function getFielStatus(): Promise<FielStatus> {
+  const response = await apiClient.get<FielStatus>('/fiel/status');
+  return response.data;
+}
+
+export async function deleteFiel(): Promise<void> {
+  await apiClient.delete('/fiel');
+}