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_cv_vocab_pipeline.py

@@ -23,7 +23,7 @@ from unittest.mock import AsyncMock, MagicMock, patch, PropertyMock
 from dataclasses import asdict
 
 # Import module under test
-from cv_vocab_pipeline import (
+from ocr.cv_pipeline import (
     ColumnGeometry,
     DocumentTypeResult,
     PageRegion,
@@ -1408,7 +1408,7 @@ class TestCellsToVocabEntriesPageRef:
 
     def test_page_ref_mapped_to_source_page(self):
         """Cell with col_type='page_ref' → source_page field populated."""
-        from cv_vocab_pipeline import _cells_to_vocab_entries
+        from ocr.cv_pipeline import _cells_to_vocab_entries
 
         cells = [
             {
@@ -1450,7 +1450,7 @@ class TestCellsToVocabEntriesPageRef:
 
     def test_no_page_ref_defaults_empty(self):
         """Without page_ref cell, source_page defaults to empty string."""
-        from cv_vocab_pipeline import _cells_to_vocab_entries
+        from ocr.cv_pipeline import _cells_to_vocab_entries
 
         cells = [
             {
@@ -1472,7 +1472,7 @@ class TestCellsToVocabEntriesPageRef:
 
     def test_marker_only_row_included(self):
         """Row with only a marker (no english/german/example) is kept."""
-        from cv_vocab_pipeline import _cells_to_vocab_entries
+        from ocr.cv_pipeline import _cells_to_vocab_entries
 
         cells = [
             # Row 0: has english + marker
@@ -1543,7 +1543,7 @@ class TestCellsToVocabEntriesPageRef:
 
     def test_page_ref_only_row_included(self):
         """Row with only source_page text is kept (no english/german/example)."""
-        from cv_vocab_pipeline import _cells_to_vocab_entries
+        from ocr.cv_pipeline import _cells_to_vocab_entries
 
         cells = [
             {