Add Granite Loader Sheet generator with CARD enrichment

Implement the Granite Team_Device Loader xlsx export feature:
- Add graniteLoaderConfig.js with all 41 columns, groupings, and
  operation-type requirements (Change/Add/Delete/Move)
- Add graniteLoaderExport.js for client-side xlsx generation using
  the xlsx library
- Add LoaderModal component with operation type selection, column
  checkboxes, bulk defaults with per-row overrides, editable preview
  table, CARD enrichment integration, and standalone paste-IPs mode
- Add POST /api/card/enrich-batch endpoint for batch IP lookup in
  CARD returning EQUIP_INST_ID, hostname, site, ASN, team
- Integrate 'Generate Loader Sheet' button in Ivanti Queue floating
  action bar (visible when CARD/GRANITE/DECOM items selected)
- Add card-connectivity-test.js script for verifying CARD API access

.gitignore

@@ -71,3 +71,4 @@ docs/data-exports/
 
 # Python cache
 __pycache__/
+docs/Team_Device Loader.xlsx