Restructure: Move 52 files into 7 domain packages

korrektur/ zeugnis/ admin/ compliance/ worksheet/ training/ metrics/
52 shims, relative imports, RAG untouched.

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

klausur-service/backend/compliance/rbac.py

@@ -0,0 +1,38 @@
+"""
+RBAC/ABAC Policy System for Klausur-Service (barrel re-export)
+
+This module was split into:
+  - rbac_types.py        (Enums, data structures)
+  - rbac_permissions.py  (Permission matrix)
+  - rbac_engine.py       (PolicyEngine, default policies, API guards)
+
+All public symbols are re-exported here for backwards compatibility.
+"""
+
+# Types and enums
+from .rbac_types import (  # noqa: F401
+    Role,
+    Action,
+    ResourceType,
+    ZKVisibilityMode,
+    EHVisibilityMode,
+    VerfahrenType,
+    PolicySet,
+    RoleAssignment,
+    KeyShare,
+    Tenant,
+    Namespace,
+    ExamPackage,
+)
+
+# Permission matrix
+from .rbac_permissions import DEFAULT_PERMISSIONS  # noqa: F401
+
+# Engine, policies, guards
+from .rbac_engine import (  # noqa: F401
+    PolicyEngine,
+    create_default_policy_sets,
+    get_policy_engine,
+    require_permission,
+    require_role,
+)