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/api.ts

@@ -0,0 +1,74 @@
+import { LoeschfristPolicy, createEmptyPolicy } from '@/lib/sdk/loeschfristen-types'
+
+export const LOESCHFRISTEN_API = '/api/sdk/v1/compliance/loeschfristen'
+
+export function apiToPolicy(raw: any): LoeschfristPolicy {
+  const base = createEmptyPolicy()
+  return {
+    ...base,
+    id: raw.id,
+    policyId: raw.policy_id || base.policyId,
+    dataObjectName: raw.data_object_name || '',
+    description: raw.description || '',
+    affectedGroups: raw.affected_groups || [],
+    dataCategories: raw.data_categories || [],
+    primaryPurpose: raw.primary_purpose || '',
+    deletionTrigger: raw.deletion_trigger || 'PURPOSE_END',
+    retentionDriver: raw.retention_driver || null,
+    retentionDriverDetail: raw.retention_driver_detail || '',
+    retentionDuration: raw.retention_duration ?? null,
+    retentionUnit: raw.retention_unit || null,
+    retentionDescription: raw.retention_description || '',
+    startEvent: raw.start_event || '',
+    hasActiveLegalHold: raw.has_active_legal_hold || false,
+    legalHolds: raw.legal_holds || [],
+    storageLocations: raw.storage_locations || [],
+    deletionMethod: raw.deletion_method || 'MANUAL_REVIEW_DELETE',
+    deletionMethodDetail: raw.deletion_method_detail || '',
+    responsibleRole: raw.responsible_role || '',
+    responsiblePerson: raw.responsible_person || '',
+    releaseProcess: raw.release_process || '',
+    linkedVVTActivityIds: raw.linked_vvt_activity_ids || [],
+    linkedVendorIds: raw.linked_vendor_ids || [],
+    status: raw.status || 'DRAFT',
+    lastReviewDate: raw.last_review_date || base.lastReviewDate,
+    nextReviewDate: raw.next_review_date || base.nextReviewDate,
+    reviewInterval: raw.review_interval || 'ANNUAL',
+    tags: raw.tags || [],
+    createdAt: raw.created_at || base.createdAt,
+    updatedAt: raw.updated_at || base.updatedAt,
+  }
+}
+
+export function policyToPayload(p: LoeschfristPolicy): any {
+  return {
+    policy_id: p.policyId,
+    data_object_name: p.dataObjectName,
+    description: p.description,
+    affected_groups: p.affectedGroups,
+    data_categories: p.dataCategories,
+    primary_purpose: p.primaryPurpose,
+    deletion_trigger: p.deletionTrigger,
+    retention_driver: p.retentionDriver || null,
+    retention_driver_detail: p.retentionDriverDetail,
+    retention_duration: p.retentionDuration || null,
+    retention_unit: p.retentionUnit || null,
+    retention_description: p.retentionDescription,
+    start_event: p.startEvent,
+    has_active_legal_hold: p.hasActiveLegalHold,
+    legal_holds: p.legalHolds,
+    storage_locations: p.storageLocations,
+    deletion_method: p.deletionMethod,
+    deletion_method_detail: p.deletionMethodDetail,
+    responsible_role: p.responsibleRole,
+    responsible_person: p.responsiblePerson,
+    release_process: p.releaseProcess,
+    linked_vvt_activity_ids: p.linkedVVTActivityIds,
+    linked_vendor_ids: p.linkedVendorIds,
+    status: p.status,
+    last_review_date: p.lastReviewDate || null,
+    next_review_date: p.nextReviewDate || null,
+    review_interval: p.reviewInterval,
+    tags: p.tags,
+  }
+}