Add config and client injection with test reorganization.

Introduce typed config objects, optional adapter injection, and .env loading to simplify testing while preserving env-based defaults for production usage.

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

python_repositories/config/redis_config.py

@@ -0,0 +1,30 @@
+"""Redis connection configuration."""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+
+from python_utils import check_env
+
+from python_repositories.config.dotenv_loader import load_dotenv
+
+
+@dataclass(frozen=True)
+class RedisConfig:
+    """Configuration for connecting to Redis."""
+
+    uri: str
+
+    @classmethod
+    def from_env(
+        cls,
+        uri_env_var_name: str = "REDIS_URI",
+        *,
+        use_dotenv: bool = True,
+    ) -> RedisConfig:
+        """Load configuration from environment variables."""
+        if use_dotenv:
+            load_dotenv()
+        check_env(uri_env_var_name)
+        return cls(uri=str(os.getenv(uri_env_var_name)))