feat(sat): add SAT authentication and download services (Phase 3)

- Add sat-auth.service.ts for SAML token authentication with SAT
  using FIEL credentials and SOAP protocol
- Add sat-download.service.ts with full download workflow:
  - Request CFDI download (emitted/received)
  - Verify request status with polling support
  - Download ZIP packages when ready
  - Helper functions for status checking
- Install fast-xml-parser and adm-zip dependencies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/package.json

@@ -17,17 +17,20 @@
     "@horux/shared": "workspace:*",
     "@nodecfdi/credentials": "^3.2.0",
     "@prisma/client": "^5.22.0",
+    "adm-zip": "^0.5.16",
     "bcryptjs": "^2.4.3",
     "cors": "^2.8.5",
     "dotenv": "^17.2.3",
     "exceljs": "^4.4.0",
     "express": "^4.21.0",
+    "fast-xml-parser": "^5.3.3",
     "helmet": "^8.0.0",
     "jsonwebtoken": "^9.0.2",
     "node-forge": "^1.3.3",
     "zod": "^3.23.0"
   },
   "devDependencies": {
+    "@types/adm-zip": "^0.5.7",
     "@types/bcryptjs": "^2.4.6",
     "@types/cors": "^2.8.17",
     "@types/express": "^5.0.0",