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/routes/__init__.py

@@ -5,6 +5,7 @@ from app.routes import (
     ai_copilot,  # noqa: F401
     attachments,  # noqa: F401
     audit,  # noqa: F401
+    compliance,  # noqa: F401
     auth,  # noqa: F401
     bank_accounts,  # noqa: F401
     contacts,  # noqa: F401