feat: Asset register in ISMS module (ISO 27001 Annex A.5.9)

New "Assets" tab in the ISMS module for information asset management:
- CRUD for information assets (hardware, software, data, services,
  people, facilities)
- CIA protection need matrix (confidentiality, integrity, availability)
  with normal/high/very_high levels
- Information classification (public, internal, confidential,
  strictly confidential) with color-coded badges
- Category filter (all/hardware/software/data/service/people/facility)
- Stats cards (total, by category, high protection need count)
- CSV export for ISO 27001 audits
- Edit/delete per asset
- localStorage persistence (same pattern as compliance_scope)

Types: InformationAsset, AssetCategory, AssetClassification,
ProtectionLevel interfaces + label/color maps

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

admin-compliance/app/sdk/isms/page.tsx

@@ -8,6 +8,7 @@ import { SoATab } from './_components/SoATab'
 import { ObjectivesTab } from './_components/ObjectivesTab'
 import { AuditsTab } from './_components/AuditsTab'
 import { ReviewsTab } from './_components/ReviewsTab'
+import { AssetsTab } from './_components/AssetsTab'
 
 // =============================================================================
 // MAIN PAGE
@@ -20,6 +21,7 @@ const TABS: { id: TabId; label: string }[] = [
   { id: 'objectives', label: 'Ziele' },
   { id: 'audits', label: 'Audits & Findings' },
   { id: 'reviews', label: 'Management Reviews' },
+  { id: 'assets', label: 'Assets' },
 ]
 
 export default function ISMSPage() {
@@ -59,6 +61,7 @@ export default function ISMSPage() {
         {tab === 'objectives' && <ObjectivesTab />}
         {tab === 'audits' && <AuditsTab />}
         {tab === 'reviews' && <ReviewsTab />}
+        {tab === 'assets' && <AssetsTab />}
       </div>
     </div>
   )