feat(document-generator): 33 policy + module document templates

- Migration 071: 14 IT-Security policy templates (ISO 27001/BSI)
  information_security, access_control, password, encryption, logging,
  backup, incident_response, change_management, patch_management,
  asset_management, cloud_security, devsecops, secrets_management,
  vulnerability_management
- Migration 072: 15 Data/HR/Vendor/BCM policy templates
  data_protection, data_classification, data_retention, data_transfer,
  privacy_incident, employee_security, security_awareness, remote_work,
  offboarding, vendor_risk_management, third_party_security,
  supplier_security, business_continuity, disaster_recovery,
  crisis_management
- Migration 073: 4 module document reference templates
  vvt_register, tom_documentation, loeschkonzept, pflichtenregister
- TemplateType union: 17 → 61 types with German labels
- VALID_DOCUMENT_TYPES: +6 types (cybersecurity_policy, dsfa, 4 module docs)
- CATEGORIES: new "DSGVO-Dokumente" category for module documents

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

backend-compliance/compliance/api/legal_template_routes.py

@@ -92,6 +92,15 @@ VALID_DOCUMENT_TYPES = {
     "business_continuity_policy",
     "disaster_recovery_policy",
     "crisis_management_policy",
+    # CRA Cybersecurity (Migration 056)
+    "cybersecurity_policy",
+    # DSFA template
+    "dsfa",
+    # Module document templates (Migration 073)
+    "vvt_register",
+    "tom_documentation",
+    "loeschkonzept",
+    "pflichtenregister",
 }
 VALID_STATUSES = {"published", "draft", "archived"}