refactor: Move Screening to Zusatzmodule (optional)

- Screening step: isOptional=true
- Compliance Modules no longer depends on Screening
- Description updated to "SBOM + Vulnerability Scan (OSV.dev)"

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

admin-compliance/lib/sdk/types/sdk-steps.ts

@@ -65,11 +65,11 @@ export const SDK_STEPS: SDKStep[] = [
     order: 5,
     name: 'System Screening',
     nameShort: 'Screening',
-    description: 'SBOM + Security Check',
+    description: 'SBOM + Vulnerability Scan (OSV.dev)',
     url: '/sdk/screening',
     checkpointId: 'CP-SCAN',
     prerequisiteSteps: ['use-case-assessment'],
-    isOptional: false },
+    isOptional: true },
   {
     id: 'modules',
     seq: 600,
@@ -81,7 +81,7 @@ export const SDK_STEPS: SDKStep[] = [
     description: 'Abgleich welche Regulierungen gelten',
     url: '/sdk/modules',
     checkpointId: 'CP-MOD',
-    prerequisiteSteps: ['screening'],
+    prerequisiteSteps: ['use-case-assessment'],
     isOptional: false },
   {
     id: 'source-policy',