Restructure: Move 47 cv_* files into ocr/ package

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

klausur-service/backend/ocr/engines/engines.py

@@ -24,7 +24,7 @@ from typing import Any, Dict, List, Optional, Tuple
 
 import numpy as np
 
-from cv_vocab_types import (
+from ..types import (
     IPA_AVAILABLE,
     PageRegion,
     RowGeometry,
@@ -47,7 +47,7 @@ except ImportError:
 
 # ── Re-exports from sub-modules (backward compatibility) ──────────────────
 
-from cv_ocr_word_assembly import (  # noqa: F401
+from .word_assembly import (  # noqa: F401
     _group_words_into_lines,
     _words_to_reading_order_lines,
     _rejoin_hyphenated,
@@ -55,7 +55,7 @@ from cv_ocr_word_assembly import (  # noqa: F401
     _words_to_spaced_text,
 )
 
-from cv_ocr_vocab_postprocess import (  # noqa: F401
+from .vocab_postprocess import (  # noqa: F401
     _CHAR_CONFUSION_RULES,
     _DE_INDICATORS_FOR_EN_I,
     _fix_character_confusion,
@@ -66,7 +66,7 @@ from cv_ocr_vocab_postprocess import (  # noqa: F401
     _attach_example_sentences,
 )
 
-from cv_ocr_ipa_lookup import (  # noqa: F401
+from .ipa_lookup import (  # noqa: F401
     _PHONETIC_BRACKET_RE,
     _IPA_CHARS,
     _MIN_WORD_CONF,
@@ -80,20 +80,20 @@ from cv_ocr_ipa_lookup import (  # noqa: F401
     _insert_missing_ipa,
 )
 
-from cv_ocr_ipa_repair import (  # noqa: F401
+from .ipa_repair import (  # noqa: F401
     _has_non_dict_trailing,
     _strip_post_bracket_garbled,
     fix_ipa_continuation_cell,
     _insert_headword_ipa,
 )
 
-from cv_ocr_cell_phonetics import (  # noqa: F401
+from .cell_phonetics import (  # noqa: F401
     fix_cell_phonetics,
     _has_ipa_gap,
     _sync_word_boxes_after_ipa_insert,
 )
 
-from cv_ocr_cell_filter import (  # noqa: F401
+from .cell_filter import (  # noqa: F401
     _RE_REAL_WORD,
     _RE_ALPHA,
     _COMMON_SHORT_WORDS,