feat: Vorbereitung-Module auf 100% — Compliance-Scope Backend, DELETE-Endpoints, Proxy-Fixes, blocked-content Tab

Paket A — Kritische Blocker:
- compliance_scope_routes.py: GET + POST UPSERT für sdk_states JSONB-Feld
- compliance/api/__init__.py: compliance_scope_router registriert
- import/route.ts: POST-Proxy für multipart/form-data Upload
- screening/route.ts: POST-Proxy für Dependency-File Upload

Paket B — Backend + UI:
- company_profile_routes.py: DELETE-Endpoint (DSGVO Art. 17)
- company-profile/route.ts: DELETE-Proxy
- company-profile/page.tsx: Profil-löschen-Button mit Bestätigungs-Dialog
- source-policy/pii-rules/[id]/route.ts: GET ergänzt
- source-policy/operations/[id]/route.ts: GET + DELETE ergänzt

Paket C — Tests + UI:
- test_compliance_scope_routes.py: 27 Tests (neu)
- test_import_routes.py: +36 Tests → 60 gesamt
- test_screening_routes.py: +28 Tests → 80+ gesamt
- source-policy/page.tsx: "Blockierte Inhalte" Tab mit Tabelle + Remove

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

admin-compliance/app/api/sdk/v1/company-profile/route.ts

@@ -80,6 +80,43 @@ export async function POST(request: NextRequest) {
   }
 }
 
+/**
+ * Proxy: DELETE /api/sdk/v1/company-profile → Backend DELETE /api/v1/company-profile
+ * DSGVO Art. 17 Recht auf Löschung
+ */
+export async function DELETE(request: NextRequest) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const tenantId = searchParams.get('tenant_id') || 'default'
+
+    const response = await fetch(
+      `${BACKEND_URL}/api/v1/company-profile?tenant_id=${encodeURIComponent(tenantId)}`,
+      {
+        method: 'DELETE',
+        headers: {
+          'X-Tenant-ID': tenantId,
+        },
+      }
+    )
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      return NextResponse.json(
+        { error: 'Backend error', details: errorText },
+        { status: response.status }
+      )
+    }
+
+    return NextResponse.json(await response.json())
+  } catch (error) {
+    console.error('Failed to delete company profile:', error)
+    return NextResponse.json(
+      { error: 'Failed to connect to backend' },
+      { status: 503 }
+    )
+  }
+}
+
 /**
  * Proxy: PATCH /api/sdk/v1/company-profile → Backend PATCH /api/v1/company-profile
  * Partial updates for individual fields