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/sat.ts

@@ -0,0 +1,45 @@
+import { apiClient } from './client';
+import type {
+  SatSyncJob,
+  SatSyncStatusResponse,
+  SatSyncHistoryResponse,
+  StartSyncRequest,
+  StartSyncResponse,
+} from '@horux/shared';
+
+export async function startSync(data?: StartSyncRequest): Promise<StartSyncResponse> {
+  const response = await apiClient.post<StartSyncResponse>('/sat/sync', data || {});
+  return response.data;
+}
+
+export async function getSyncStatus(): Promise<SatSyncStatusResponse> {
+  const response = await apiClient.get<SatSyncStatusResponse>('/sat/sync/status');
+  return response.data;
+}
+
+export async function getSyncHistory(page: number = 1, limit: number = 10): Promise<SatSyncHistoryResponse> {
+  const response = await apiClient.get<SatSyncHistoryResponse>('/sat/sync/history', {
+    params: { page, limit },
+  });
+  return response.data;
+}
+
+export async function getSyncJob(id: string): Promise<SatSyncJob> {
+  const response = await apiClient.get<SatSyncJob>(`/sat/sync/${id}`);
+  return response.data;
+}
+
+export async function retrySync(id: string): Promise<StartSyncResponse> {
+  const response = await apiClient.post<StartSyncResponse>(`/sat/sync/${id}/retry`);
+  return response.data;
+}
+
+export async function getCronInfo(): Promise<{ scheduled: boolean; expression: string; timezone: string }> {
+  const response = await apiClient.get('/sat/cron');
+  return response.data;
+}
+
+export async function runCron(): Promise<{ message: string }> {
+  const response = await apiClient.post('/sat/cron/run');
+  return response.data;
+}