feat(admin-v2): Major SDK/Compliance overhaul and new modules

SDK modules added/enhanced:
- compliance-hub, compliance-scope, consent-management, notfallplan
- audit-report, workflow, source-policy, dsms
- advisory-board documentation section
- TOM dashboard components, TOM generator SDM mapping
- DSFA: mitigation library, risk catalog, threshold analysis, source attribution
- VVT: baseline catalog, profiling engine, types
- Loeschfristen: baseline catalog, compliance engine, export, profiling, types
- Compliance scope: engine, profiling, golden tests, types

Existing SDK pages updated:
- dsfa/[id], tom, vvt, loeschfristen, advisory-board — expanded functionality
- SDKSidebar, StepHeader — new navigation items and layout
- SDK layout, context, types — expanded type system

Other admin-v2 changes:
- AI agents page, RAG pipeline DSFA integration
- GridOverlay component updates
- Companion feature (development + education)
- Compliance advisor SOUL definition

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

admin-v2/lib/navigation.ts

@@ -486,15 +486,6 @@ export const navigation: NavCategory[] = [
         audience: ['Lehrer', 'Entwickler'],
         oldAdminPath: '/admin/klausur-korrektur',
       },
-      {
-        id: 'companion',
-        name: 'Companion',
-        href: '/education/companion',
-        description: 'Unterrichts-Timer & Phasen',
-        purpose: 'Strukturierter Unterricht mit 5-Phasen-Modell (E-A-S-T-R). Visual Timer, Hausaufgaben-Tracking und Reflexion.',
-        audience: ['Lehrer'],
-        oldAdminPath: '/admin/companion',
-      },
     ],
   },
   // =========================================================================