Fix optional dependency handling for Redis and MinIO adapters.

Lazy-load adapters at package boundaries and fail fast with install hints when extras are missing.

Co-authored-by: Cursor <[email protected]>

python_repositories/adapters/minio_adapter.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 import os
 from io import BytesIO
-from importlib.util import find_spec
 from typing import Self
 import structlog
 from python_utils import check_env
@@ -14,9 +13,13 @@ from python_repositories.interfaces import (
     ObjectRepositoryInterface,
 )
 
-# Handle optional dependencies
-if find_spec("minio") is not None:
+try:
     import minio
+except ImportError as exc:
+    raise ImportError(
+        "MinIO support requires the minio extra. "
+        "Install with: pip install python-repositories[minio]"
+    ) from exc
 
 
 class MinioAdapter(
@@ -112,7 +115,7 @@ class MinioAdapter(
     @property
     def is_connected(self) -> bool:
         """Check if connected to Minio server."""
-        res = bool(isinstance(self._client, minio.Minio))
+        res = self._client is not None
         self.logger.debug(res)
         return res