feat: Obligations-Modul auf 100% — vollständige CRUD-Implementierung

- Backend: compliance_obligations Tabelle (Migration 013)
- Backend: obligation_routes.py — GET/POST/PUT/DELETE + Stats-Endpoint
- Backend: obligation_router in __init__.py registriert
- Frontend: obligations/page.tsx — ObligationModal, ObligationDetail, ObligationCard, alle Buttons verdrahtet
- Proxy: PATCH-Methode in compliance catch-all route ergänzt
- Tests: 39/39 Obligation-Tests (Schemas, Helpers, Business Logic)

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

admin-compliance/app/api/sdk/v1/compliance/[[...path]]/route.ts

@@ -47,7 +47,7 @@ async function proxyRequest(
       signal: AbortSignal.timeout(60000),
     }
 
-    if (method === 'POST' || method === 'PUT') {
+    if (method === 'POST' || method === 'PUT' || method === 'PATCH') {
       const body = await request.text()
       if (body) {
         fetchOptions.body = body
@@ -118,6 +118,14 @@ export async function PUT(
   return proxyRequest(request, path, 'PUT')
 }
 
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ path?: string[] }> }
+) {
+  const { path } = await params
+  return proxyRequest(request, path, 'PATCH')
+}
+
 export async function DELETE(
   request: NextRequest,
   { params }: { params: Promise<{ path?: string[] }> }