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/redis_adapter.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 from typing import Self, cast
-from importlib.util import find_spec
 import os
 import structlog
 
@@ -14,10 +13,14 @@ from python_repositories.interfaces import (
     JsonRepositoryInterface,
 )
 
-# Handle optional dependencies
-if find_spec("redis") is not None:
+try:
     import redis
     from redis.commands.json.path import Path as RedisPath
+except ImportError as exc:
+    raise ImportError(
+        "Redis support requires the redis extra. "
+        "Install with: pip install python-repositories[redis]"
+    ) from exc
 
 
 class RedisAdapter(
@@ -90,7 +93,7 @@ class RedisAdapter(
     @property
     def is_connected(self) -> bool:
         """Check if connected to Redis server."""
-        res = bool(isinstance(self._client, redis.Redis))
+        res = self._client is not None
         self.logger.debug(res)
         return res