feat(K): Phase K EU Compliance — AI Registry, DPIA, Incident Register, Retention Admin, Tests, Doku

- K-REG: GET /api/v1/compliance/ai-registry — lists all agents with ai_use_case_metadata
- K-DPIA: GET /api/v1/compliance/dpia-template — pre-filled DPIA template export
- K-INC: ComplianceIncident model, Migration 0133 (RLS), CRUD routes (admin-only)
- K-RET: GET/PATCH /api/v1/compliance/retention-policies — 5 policies editable
- K-COMP-TEST: 12/12 integration tests pass
- K-DOC: docs/compliance.md — Betriebsdoku
- Frontend: ComplianceTab.tsx in SettingsAI.tsx (new tab)
- 13 files created/modified

app/models/__init__.py

@@ -8,6 +8,7 @@ from app.models.auth import ApiToken, PasswordResetToken
 from app.models.backup import Backup
 from app.models.bank_account import BankAccount
 from app.models.consumer_inbox import ConsumerInbox
+from app.models.compliance import ComplianceIncident
 from app.models.contact import Contact, ContactPerson
 from app.models.contact_folder import ContactFolder
 from app.models.contact_merge import ContactMergeHistory
@@ -47,6 +48,7 @@ __all__ = [
     "NotificationPreference",
     "PasswordResetToken",
     "ApiToken",
+    "ComplianceIncident",
     "Contact",
     "ContactPerson",
     "ContactFolder",