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/einwilligungen/hooks.tsx

@@ -0,0 +1,18 @@
+'use client'
+
+// =============================================================================
+// Einwilligungen Hook
+// Custom hook for consuming the Einwilligungen context
+// =============================================================================
+
+import { useContext } from 'react'
+import { EinwilligungenContext } from './provider'
+import type { EinwilligungenContextValue } from './provider'
+
+export function useEinwilligungen(): EinwilligungenContextValue {
+  const context = useContext(EinwilligungenContext)
+  if (!context) {
+    throw new Error('useEinwilligungen must be used within EinwilligungenProvider')
+  }
+  return context
+}