Restructure: Move 47 cv_* files into ocr/ package

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

klausur-service/backend/ocr/layout/classify.py

@@ -11,16 +11,16 @@ from typing import Dict, List, Optional
 
 import numpy as np
 
-from cv_vocab_types import ColumnGeometry, PageRegion
+from ..types import ColumnGeometry, PageRegion
 
-from cv_layout_scoring import (
+from .scoring import (
     _score_language,
     _score_role,
     _score_dictionary_signals,
     _classify_dictionary_columns,
 )
 
-from cv_layout_classify_position import (
+from .classify_position import (
     _classify_by_position_enhanced,
     _classify_by_position_fallback,
 )
@@ -211,7 +211,7 @@ def classify_column_types(geometries: List[ColumnGeometry],
     # _add_header_footer lives in cv_layout (avoids circular import at module
     # level).  Lazy-import here so the module can be tested independently when
     # cv_layout hasn't been modified yet.
-    from cv_layout_detection import _add_header_footer  # noqa: E402
+    from .detection import _add_header_footer  # noqa: E402
 
     content_h = bottom_y - top_y