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_labeling_api.py

@@ -1,81 +1,4 @@
-"""
-OCR Labeling API — Barrel Re-export
-
-Split into:
-- ocr_labeling_models.py         — Pydantic models and constants
-- ocr_labeling_helpers.py        — OCR wrappers, image storage, hashing
-- ocr_labeling_routes.py         — Session/queue/labeling route handlers
-- ocr_labeling_upload_routes.py  — Upload, run-OCR, export route handlers
-
-All public names are re-exported here for backward compatibility.
-"""
-
-# Models
-from ocr_labeling_models import (  # noqa: F401
-    LOCAL_STORAGE_PATH,
-    SessionCreate,
-    SessionResponse,
-    ItemResponse,
-    ConfirmRequest,
-    CorrectRequest,
-    SkipRequest,
-    ExportRequest,
-    StatsResponse,
-)
-
-# Helpers
-from ocr_labeling_helpers import (  # noqa: F401
-    VISION_OCR_AVAILABLE,
-    PADDLEOCR_AVAILABLE,
-    TROCR_AVAILABLE,
-    DONUT_AVAILABLE,
-    MINIO_AVAILABLE,
-    TRAINING_EXPORT_AVAILABLE,
-    compute_image_hash,
-    run_ocr_on_image,
-    run_vision_ocr_wrapper,
-    run_paddleocr_wrapper,
-    run_trocr_wrapper,
-    run_donut_wrapper,
-    save_image_locally,
-    get_image_url,
-)
-
-# Conditional re-exports from helpers' optional imports
-try:
-    from minio_storage import upload_ocr_image, get_ocr_image, MINIO_BUCKET  # noqa: F401
-except ImportError:
-    pass
-
-try:
-    from training_export_service import (  # noqa: F401
-        TrainingExportService,
-        TrainingSample,
-        get_training_export_service,
-    )
-except ImportError:
-    pass
-
-try:
-    from hybrid_vocab_extractor import run_paddle_ocr  # noqa: F401
-except ImportError:
-    pass
-
-try:
-    from services.trocr_service import run_trocr_ocr  # noqa: F401
-except ImportError:
-    pass
-
-try:
-    from services.donut_ocr_service import run_donut_ocr  # noqa: F401
-except ImportError:
-    pass
-
-try:
-    from vision_ocr_service import get_vision_ocr_service, VisionOCRService  # noqa: F401
-except ImportError:
-    pass
-
-# Routes (router is the main export for app.include_router)
-from ocr_labeling_routes import router  # noqa: F401
-from ocr_labeling_upload_routes import router as upload_router  # noqa: F401
+# Backward-compat shim -- module moved to ocr/labeling/api.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("ocr.labeling.api")