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/app/sdk/tom/page.tsx

@@ -35,7 +35,7 @@ const TABS: TabDefinition[] = [
 export default function TOMPage() {
   const router = useRouter()
   const sdk = useSDK()
-  const { state, dispatch, bulkUpdateTOMs, runGapAnalysis } = useTOMGenerator()
+  const { state, dispatch, runGapAnalysis } = useTOMGenerator()
 
   // ---------------------------------------------------------------------------
   // Local state
@@ -53,7 +53,6 @@ export default function TOMPage() {
     status: string
     lastTestedAt?: string
   }>>([])
-  const [vendorControlsLoading, setVendorControlsLoading] = useState(false)
 
   // ---------------------------------------------------------------------------
   // Compliance check (auto-run when derivedTOMs change)
@@ -71,7 +70,6 @@ export default function TOMPage() {
 
   useEffect(() => {
     if (tab !== 'uebersicht') return
-    setVendorControlsLoading(true)
     Promise.all([
       fetch('/api/sdk/v1/vendor-compliance/control-instances?limit=500').then(r => r.ok ? r.json() : null),
       fetch('/api/sdk/v1/vendor-compliance/vendors?limit=500').then(r => r.ok ? r.json() : null),
@@ -95,7 +93,7 @@ export default function TOMPage() {
           lastTestedAt: ci.lastTestedAt || ci.last_tested_at,
         }))
       setVendorControls(tomControls)
-    }).catch(() => {}).finally(() => setVendorControlsLoading(false))
+    }).catch(() => {})
   }, [tab])
 
   // ---------------------------------------------------------------------------