refactor(admin): split loeschfristen and vvt pages

Reduce both page.tsx files below the 500-LOC hard cap by extracting
all inline tab components and API helpers into colocated _components/.
- loeschfristen/page.tsx: 2720 → 467 LOC
- vvt/page.tsx: 2297 → 256 LOC
New files: LoeschkonzeptTab, loeschfristen/api, TabDokument, TabProcessor
Updated: TabVerzeichnis (template picker + badge), vvt/api (template helpers)
Fixed: VVTLinkSection wrong field name (linkedVVTActivityIds), VendorLinkSection added

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

admin-compliance/app/sdk/loeschfristen/_components/EditorTab.tsx

@@ -7,7 +7,7 @@ import {
 import { renderStatusBadge } from './UebersichtTab'
 import {
   DataObjectSection, DeletionLogicSection, StorageSection,
-  ResponsibilitySection, VVTLinkSection, ReviewSection,
+  ResponsibilitySection, VVTLinkSection, VendorLinkSection, ReviewSection,
 } from './EditorSections'
 
 // ---------------------------------------------------------------------------
@@ -19,6 +19,7 @@ interface EditorTabProps {
   editingId: string | null
   editingPolicy: LoeschfristPolicy | null
   vvtActivities: any[]
+  vendorList: Array<{id: string; name: string}>
   saving: boolean
   setEditingId: (id: string | null) => void
   setTab: (tab: 'uebersicht' | 'editor' | 'generator' | 'export') => void
@@ -79,7 +80,7 @@ function EditorNoSelection({
 // ---------------------------------------------------------------------------
 
 function EditorForm({
-  policy, vvtActivities, saving, setEditingId, setTab,
+  policy, vvtActivities, vendorList, saving, setEditingId, setTab,
   updatePolicy, deletePolicy, addLegalHold, removeLegalHold,
   addStorageLocation, removeStorageLocation, handleSaveAndClose,
 }: Omit<EditorTabProps, 'policies' | 'editingId' | 'editingPolicy' | 'createNewPolicy'> & {
@@ -127,6 +128,7 @@ function EditorForm({
         addStorageLocation={addStorageLocation} removeStorageLocation={removeStorageLocation} />
       <ResponsibilitySection policy={policy} set={set} />
       <VVTLinkSection policy={policy} pid={pid} vvtActivities={vvtActivities} updatePolicy={updatePolicy} />
+      <VendorLinkSection policy={policy} pid={pid} vendorList={vendorList} updatePolicy={updatePolicy} />
       <ReviewSection policy={policy} set={set} />
 
       {/* Action buttons */}