Restructure: Move ocr_pipeline + labeling + crop into ocr/ package

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

klausur-service/backend/ocr_pipeline_geometry.py

@@ -1,27 +1,4 @@
-"""
-OCR Pipeline Geometry API (barrel re-export)
-
-This module was split into:
-  - ocr_pipeline_deskew.py     (Deskew endpoints)
-  - ocr_pipeline_dewarp.py     (Dewarp endpoints)
-  - ocr_pipeline_structure.py  (Structure detection + exclude regions)
-  - ocr_pipeline_columns.py    (Column detection + ground truth)
-
-The `router` object is assembled here by including all sub-routers.
-Importers that did `from ocr_pipeline_geometry import router` continue to work.
-"""
-
-from fastapi import APIRouter
-
-from ocr_pipeline_deskew import router as _deskew_router
-from ocr_pipeline_dewarp import router as _dewarp_router
-from ocr_pipeline_structure import router as _structure_router
-from ocr_pipeline_columns import router as _columns_router
-
-# Assemble the combined router.
-# All sub-routers use prefix="/api/v1/ocr-pipeline", so include without extra prefix.
-router = APIRouter()
-router.include_router(_deskew_router)
-router.include_router(_dewarp_router)
-router.include_router(_structure_router)
-router.include_router(_columns_router)
+# Backward-compat shim -- module moved to ocr/pipeline/geometry.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("ocr.pipeline.geometry")