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/vvt/_components/api.ts

@@ -138,3 +138,25 @@ export async function apiUpsertOrganization(org: VVTOrganizationHeader): Promise
   if (!res.ok) throw new Error(`PUT organization failed: ${res.status}`)
   return orgHeaderFromApi(await res.json())
 }
+
+export interface ProcessTemplate {
+  id: string; name: string; description?: string; business_function: string
+  purpose_refs: string[]; legal_basis_refs: string[]; data_subject_refs: string[]
+  data_category_refs: string[]; recipient_refs: string[]; tom_refs: string[]
+  retention_rule_ref?: string; typical_systems: string[]
+  protection_level: string; dpia_required: boolean; risk_score?: number
+  tags: string[]; sort_order: number
+}
+
+export async function apiListTemplates(businessFunction?: string): Promise<ProcessTemplate[]> {
+  const params = businessFunction ? `?business_function=${businessFunction}` : ''
+  const res = await fetch(`${VVT_API_BASE}/templates${params}`)
+  if (!res.ok) return []
+  return res.json()
+}
+
+export async function apiInstantiateTemplate(templateId: string): Promise<VVTActivity> {
+  const res = await fetch(`${VVT_API_BASE}/templates/${templateId}/instantiate`, { method: 'POST' })
+  if (!res.ok) throw new Error(`POST instantiate failed: ${res.status}`)
+  return activityFromApi(await res.json())
+}