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/zeugnis_crawler.py

@@ -1,26 +1,4 @@
-"""
-Zeugnis Rights-Aware Crawler
-
-Barrel re-export: all public symbols for backward compatibility.
-"""
-
-from zeugnis_text import (  # noqa: F401
-    extract_text_from_pdf,
-    extract_text_from_html,
-    chunk_text,
-    compute_hash,
-)
-from zeugnis_storage import (  # noqa: F401
-    generate_embeddings,
-    upload_to_minio,
-    index_in_qdrant,
-)
-from zeugnis_worker import (  # noqa: F401
-    CrawlerState,
-    ZeugnisCrawler,
-)
-from zeugnis_control import (  # noqa: F401
-    start_crawler,
-    stop_crawler,
-    get_crawler_status,
-)
+# Backward-compat shim -- module moved to zeugnis/crawler.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("zeugnis.crawler")