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/routes/archiv.py

@@ -13,7 +13,7 @@ from pydantic import BaseModel
 
 from qdrant_service import get_qdrant_client, search_nibis_eh
 from minio_storage import get_presigned_url, list_documents
-from eh_pipeline import generate_single_embedding
+from korrektur.eh_pipeline import generate_single_embedding
 
 router = APIRouter()
 

klausur-service/backend/routes/eh_upload.py

@@ -33,7 +33,7 @@ import storage
 from qdrant_service import (
     get_collection_info, delete_eh_vectors, search_eh, index_eh_chunks
 )
-from eh_pipeline import (
+from korrektur.eh_pipeline import (
     decrypt_text, verify_key_hash, process_eh_for_indexing,
     generate_single_embedding, EncryptionError, EmbeddingError
 )

klausur-service/backend/routes/grading.py

@@ -25,9 +25,9 @@ import storage
 
 # BYOEH imports (conditional)
 try:
-    from eh_pipeline import decrypt_text, EncryptionError
+    from korrektur.eh_pipeline import decrypt_text, EncryptionError
     from qdrant_service import search_eh
-    from eh_pipeline import generate_single_embedding
+    from korrektur.eh_pipeline import generate_single_embedding
     BYOEH_AVAILABLE = True
 except ImportError:
     BYOEH_AVAILABLE = False