refactor: remove 473 lines of dead code across 5 SDK modules

- obligations: unused vendors state/fetch, unreachable filter==='ai' path
- tom: unused vendorControlsLoading state, unused bulkUpdateTOMs import
- loeschfristen: unused BASELINE_TEMPLATES imports, sdk hook, managingLegalHolds state
- vvt: unused apiGetCompleteness/apiGetLibrary, 7 unused VVTLib* interfaces
- vendor-compliance: 11 unused context methods, 6 unused selector hooks, ContractUploadData type

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-compliance/lib/sdk/vendor-compliance/index.ts

@@ -21,12 +21,6 @@ export * from './types'
 export {
   VendorComplianceProvider,
   useVendorCompliance,
-  useVendor,
-  useProcessingActivity,
-  useVendorContracts,
-  useVendorFindings,
-  useContractFindings,
-  useControlInstancesForEntity,
 } from './context'
 
 // ==========================================