refactor(admin): split multi-tenant page.tsx into colocated components

Extract types, constants, helpers, and UI pieces (LoadingSkeleton,
EmptyState, StatCard, ComplianceRing, Modal, TenantCard,
CreateTenantModal, EditTenantModal, TenantDetailModal) into
_components/ and _types.ts to bring page.tsx from 1663 LOC to
432 LOC (under the 500 hard cap). Behavior preserved.

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

admin-compliance/app/sdk/multi-tenant/_components/constants.ts

@@ -0,0 +1,58 @@
+import type { CreateNamespaceForm, CreateTenantForm, SortField, StatusFilter } from '../_types'
+
+export const FALLBACK_TENANT_ID = '00000000-0000-0000-0000-000000000001'
+export const FALLBACK_USER_ID = '00000000-0000-0000-0000-000000000001'
+export const API_BASE = '/api/sdk/v1/multi-tenant'
+
+export const STATUS_OPTIONS = [
+  { value: 'active', label: 'Aktiv' },
+  { value: 'suspended', label: 'Suspendiert' },
+  { value: 'inactive', label: 'Inaktiv' },
+]
+
+export const FILTER_OPTIONS: { value: StatusFilter; label: string }[] = [
+  { value: 'all', label: 'Alle' },
+  { value: 'active', label: 'Aktiv' },
+  { value: 'suspended', label: 'Suspendiert' },
+  { value: 'inactive', label: 'Inaktiv' },
+]
+
+export const SORT_OPTIONS: { value: SortField; label: string }[] = [
+  { value: 'name', label: 'Name' },
+  { value: 'score', label: 'Score' },
+  { value: 'risk', label: 'Risiko' },
+]
+
+export const ISOLATION_LEVELS = [
+  { value: 'shared', label: 'Shared' },
+  { value: 'isolated', label: 'Isoliert' },
+  { value: 'dedicated', label: 'Dediziert' },
+]
+
+export const DATA_CLASSIFICATIONS = [
+  { value: 'public', label: 'Oeffentlich' },
+  { value: 'internal', label: 'Intern' },
+  { value: 'confidential', label: 'Vertraulich' },
+  { value: 'restricted', label: 'Eingeschraenkt' },
+]
+
+export const RISK_ORDER: Record<string, number> = {
+  LOW: 0,
+  MEDIUM: 1,
+  HIGH: 2,
+  CRITICAL: 3,
+}
+
+export const EMPTY_CREATE_FORM: CreateTenantForm = {
+  name: '',
+  slug: '',
+  max_users: 100,
+  llm_quota_monthly: 10000,
+}
+
+export const EMPTY_NAMESPACE_FORM: CreateNamespaceForm = {
+  name: '',
+  slug: '',
+  isolation_level: 'shared',
+  data_classification: 'internal',
+}