Restore full pipeline: 3-step summarization, formatting, PDF/DOCX generation

core/__init__.py

@@ -10,6 +10,7 @@ from .exceptions import (
     FileProcessingError
 )
 from .result import Result
+from .base_service import BaseService
 
 __all__ = [
     'ProcessingError',
@@ -17,5 +18,6 @@ __all__ = [
     'AIProcessingError',
     'ConfigurationError',
     'FileProcessingError',
-    'Result'
+    'Result',
+    'BaseService'
 ]