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/rbac.py

@@ -1,38 +1,4 @@
-"""
-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,
-)
+# Backward-compat shim -- module moved to compliance/rbac.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("compliance.rbac")