refactor(admin): split 9 more oversized lib/ files into focused modules

Files split by agents before rate limit:
  - dsr/api.ts (669 → barrel + helpers)
  - einwilligungen/context.tsx (669 → barrel + hooks/reducer)
  - export.ts (753 → barrel + domain exporters)
  - incidents/api.ts (845 → barrel + api-helpers)
  - tom-generator/context.tsx (720 → barrel + hooks/reducer)
  - vendor-compliance/context.tsx (1010 → 234 provider + hooks/reducer)
  - api-docs/endpoints.ts — partially split (3 domain files created)
  - academy/api.ts — partially split (helpers extracted)
  - whistleblower/api.ts — partially split (helpers extracted)

next build passes. api-client.ts (885) deferred to next session.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -0,0 +1,88 @@
+'use client'
+
+import { useContext, useMemo, createContext } from 'react'
+import { VendorComplianceContextValue } from './types'
+
+// ==========================================
+// CONTEXT
+// ==========================================
+
+export const VendorComplianceContext = createContext<VendorComplianceContextValue | null>(null)
+
+// ==========================================
+// HOOK
+// ==========================================
+
+export function useVendorCompliance(): VendorComplianceContextValue {
+  const context = useContext(VendorComplianceContext)
+
+  if (!context) {
+    throw new Error(
+      'useVendorCompliance must be used within a VendorComplianceProvider'
+    )
+  }
+
+  return context
+}
+
+// ==========================================
+// SELECTORS
+// ==========================================
+
+export function useVendor(vendorId: string | null) {
+  const { vendors } = useVendorCompliance()
+  return useMemo(
+    () => vendors.find((v) => v.id === vendorId) ?? null,
+    [vendors, vendorId]
+  )
+}
+
+export function useProcessingActivity(activityId: string | null) {
+  const { processingActivities } = useVendorCompliance()
+  return useMemo(
+    () => processingActivities.find((a) => a.id === activityId) ?? null,
+    [processingActivities, activityId]
+  )
+}
+
+export function useVendorContracts(vendorId: string | null) {
+  const { contracts } = useVendorCompliance()
+  return useMemo(
+    () => contracts.filter((c) => c.vendorId === vendorId),
+    [contracts, vendorId]
+  )
+}
+
+export function useVendorFindings(vendorId: string | null) {
+  const { findings } = useVendorCompliance()
+  return useMemo(
+    () => findings.filter((f) => f.vendorId === vendorId),
+    [findings, vendorId]
+  )
+}
+
+export function useContractFindings(contractId: string | null) {
+  const { findings } = useVendorCompliance()
+  return useMemo(
+    () => findings.filter((f) => f.contractId === contractId),
+    [findings, contractId]
+  )
+}
+
+export function useControlInstancesForEntity(
+  entityType: 'VENDOR' | 'PROCESSING_ACTIVITY',
+  entityId: string | null
+) {
+  const { controlInstances, controls } = useVendorCompliance()
+
+  return useMemo(() => {
+    if (!entityId) return []
+
+    return controlInstances
+      .filter((ci) => ci.entityType === entityType && ci.entityId === entityId)
+      .map((ci) => ({
+        ...ci,
+        control: controls.find((c) => c.id === ci.controlId),
+      }))
+  }, [controlInstances, controls, entityType, entityId])
+}