Fix: Update all old-style imports inside packages to new paths

65 files in klausur-service packages + 3 in backend-lehrer packages
had stale imports referencing deleted shim modules.

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

klausur-service/backend/grid/editor/api_box.py

@@ -7,7 +7,7 @@ import logging
 from fastapi import APIRouter, HTTPException, Request
 
 from .filters import _words_in_zone
-from ocr_pipeline_session_store import (
+from ocr.pipeline.session_store import (
     get_session_db,
     update_session_db,
 )
@@ -76,7 +76,7 @@ async def build_box_grids(session_id: str, request: Request):
         pass
     layout_overrides = body.get("overrides", {})
 
-    from cv_box_layout import build_box_zone_grid
+    from ocr.detect.box_layout import build_box_zone_grid
 
     img_w = grid_data.get("image_width", 0) or word_result.get("image_width", 0)
     img_h = grid_data.get("image_height", 0) or word_result.get("image_height", 0)
@@ -119,7 +119,7 @@ async def build_box_grids(session_id: str, request: Request):
 
         # Apply SmartSpellChecker to all box cells
         try:
-            from smart_spell import SmartSpellChecker
+            from ocr.spell.smart_spell import SmartSpellChecker
             ssc = SmartSpellChecker()
             for cell in box_grid.get("cells", []):
                 text = cell.get("text", "")