Fix: Update all old-style imports inside packages to new paths

65 files in klausur-service packages + 3 in backend-lehrer packages
had stale imports referencing deleted shim modules.

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

klausur-service/backend/grid/build/text_ops.py

@@ -10,8 +10,8 @@ import logging
 import re
 from typing import Any, Dict, List, Optional, Set, Tuple
 
-from cv_color_detect import detect_word_colors
-from cv_ocr_engines import (
+from ocr.detect.color_detect import detect_word_colors
+from ocr.engines.engines import (
     fix_cell_phonetics, fix_ipa_continuation_cell, _text_has_garbled_ipa,
     _lookup_ipa,
 )
@@ -207,7 +207,7 @@ def _run_ipa_correction(
 
     # --- German IPA (wiki-pronunciation-dict + epitran) ---
     if de_ipa_target_cols:
-        from cv_ipa_german import insert_german_ipa
+        from ocr.ipa_german import insert_german_ipa
         insert_german_ipa(all_cells, de_ipa_target_cols)
 
     ipa_target_cols = en_ipa_target_cols | de_ipa_target_cols