Refactor code structure for improved readability and maintainability

app/services/__init__.py

@@ -1,4 +1,9 @@
-# Import mock data service
+# Import services
+from .minio import minio_service, MinioService
+from .database import db_service, DatabaseService, init_db, Document, ParseTask
+from .tasks import task_manager, get_task_status, set_task_status, generate_task_id
+
+# Import mock data service (for development)
 from .mock_data import (
     get_mock_documents,
     get_mock_quick_questions,
@@ -29,6 +34,18 @@ except ImportError:
     get_document_service = None
 
 __all__ = [
+    # Core services
+    "minio_service",
+    "MinioService",
+    "db_service",
+    "DatabaseService",
+    "init_db",
+    "Document",
+    "ParseTask",
+    "task_manager",
+    "get_task_status",
+    "set_task_status",
+    "generate_task_id",
     # Mock data services
     "get_mock_documents",
     "get_mock_quick_questions",