Restructure: Move 47 cv_* files into ocr/ package

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

klausur-service/backend/ocr/gutter/__init__.py

@@ -0,0 +1,2 @@
+"""Gutter repair sub-package."""
+from .repair import *  # noqa: F401,F403

klausur-service/backend/ocr/gutter/grid.py

@@ -11,7 +11,7 @@ import logging
 import time
 from typing import Any, Dict, List, Tuple
 
-from cv_gutter_repair_core import (
+from .core import (
     _init_spellcheckers,
     _is_ipa_text,
     _is_known,

klausur-service/backend/ocr/gutter/repair.py

@@ -10,7 +10,7 @@ DATENSCHUTZ: Alle Verarbeitung erfolgt lokal.
 """
 
 # Core: spellchecker, data types, repair helpers
-from cv_gutter_repair_core import (  # noqa: F401
+from .core import (  # noqa: F401
     _init_spellcheckers,
     _is_known,
     _spell_candidates,
@@ -29,7 +29,7 @@ from cv_gutter_repair_core import (  # noqa: F401
 )
 
 # Grid: analysis and application
-from cv_gutter_repair_grid import (  # noqa: F401
+from .grid import (  # noqa: F401
     analyse_grid_for_gutter_repair,
     apply_gutter_suggestions,
 )