Cleanup: Delete ALL 242 shims, update ALL consumer imports

klausur-service: 183 shims deleted, 26 test files + 8 source files updated
backend-lehrer: 59 shims deleted, main.py + 8 source files updated

All imports now use the new package paths directly.
Zero shims remaining in the entire codebase.

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

klausur-service/backend/tests/test_grid_editor_api.py

@@ -14,15 +14,15 @@ sys.path.insert(0, '/app')
 import cv2
 import numpy as np
 import pytest
-from cv_vocab_types import PageZone, DetectedBox
-from grid_editor_api import (
+from ocr.types import PageZone, DetectedBox
+from grid.editor.api import (
     _merge_content_zones_across_boxes,
     _filter_border_ghosts,
     _detect_header_rows,
     _detect_heading_rows_by_color,
     _detect_heading_rows_by_single_cell,
 )
-from cv_ocr_engines import _text_has_garbled_ipa, fix_ipa_continuation_cell
+from ocr.engines.engines import _text_has_garbled_ipa, fix_ipa_continuation_cell
 
 
 # ---------------------------------------------------------------------------
@@ -818,7 +818,7 @@ class TestSlashIpaConversion:
     def _run_step_5h(self, text: str) -> str:
         """Run the Step 5h regex logic on a single text string."""
         import re
-        from cv_ocr_engines import _lookup_ipa
+        from ocr.engines.engines import _lookup_ipa
 
         _SLASH_IPA_RE = re.compile(
             r'(\b[a-zA-Z]+[²³¹]?)\s*'
@@ -926,7 +926,7 @@ class TestRedFalsePositiveSuppression:
     def test_low_saturation_red_classified_as_black(self):
         """Black text with slight warm scanner tint (sat ~85) → black, not red."""
         import numpy as np
-        from cv_color_detect import detect_word_colors
+        from ocr.detect.color_detect import detect_word_colors
 
         # Create a 40x20 image with dark gray pixels (slight warm tint)
         # HSV: hue=5 (red range), sat=85 (above 55 threshold but below 90), val=40
@@ -941,7 +941,7 @@ class TestRedFalsePositiveSuppression:
     def test_high_saturation_red_classified_as_red(self):
         """Genuinely red text (sat=150) → red."""
         import numpy as np
-        from cv_color_detect import detect_word_colors
+        from ocr.detect.color_detect import detect_word_colors
 
         # White background with red text region
         # Background: white (H=0, S=0, V=255)
@@ -984,7 +984,7 @@ class TestBlueBulletFilter:
         zone = {"zone_index": 0, "cells": [cell], "rows": [], "columns": []}
 
         # Run the bullet filter logic inline
-        from grid_editor_api import _build_grid_core
+        from grid.editor.api import _build_grid_core
         # Instead, test the logic directly
         wbs = cell["word_boxes"]
         to_remove = set()
@@ -1057,7 +1057,7 @@ class TestWordBoxReadingOrder:
 
     def test_single_line_sorted_by_left(self):
         """Words on same Y line sorted by X (left) position."""
-        from cv_ocr_engines import _group_words_into_lines
+        from ocr.engines.engines import _group_words_into_lines
         wbs = [
             {"text": "up",        "left": 376, "top": 264, "width": 22, "height": 19},
             {"text": "tie",       "left": 284, "top": 264, "width": 23, "height": 14},
@@ -1069,7 +1069,7 @@ class TestWordBoxReadingOrder:
 
     def test_two_lines_preserves_line_order(self):
         """Words on two Y lines: first line first, then second line."""
-        from cv_ocr_engines import _group_words_into_lines
+        from ocr.engines.engines import _group_words_into_lines
         wbs = [
             {"text": "b)", "left": 100, "top": 290, "width": 20, "height": 15},
             {"text": "cat", "left": 50, "top": 264, "width": 30, "height": 15},
@@ -1082,7 +1082,7 @@ class TestWordBoxReadingOrder:
 
     def test_already_sorted_unchanged(self):
         """Already-sorted word_boxes stay in same order."""
-        from cv_ocr_engines import _group_words_into_lines
+        from ocr.engines.engines import _group_words_into_lines
         wbs = [
             {"text": "tie",    "left": 284, "top": 264, "width": 23, "height": 14},
             {"text": "sb/sth", "left": 309, "top": 264, "width": 57, "height": 20},