Avoid eager imports to fix circular dependency

src/nostr/__init__.py

@@ -1,21 +1,16 @@
 # nostr/__init__.py
 
-import logging
-import traceback
-from .client import NostrClient
+"""Nostr package exposing :class:`NostrClient` lazily."""
+
+from importlib import import_module
+import logging
 
-# Instantiate the logger
 logger = logging.getLogger(__name__)
 
-# Initialize the logger for this module
-logger = logging.getLogger(__name__)  # Correct logger initialization
-
-try:
-    from .client import NostrClient
-
-    logger.info("NostrClient module imported successfully.")
-except Exception as e:
-    logger.error(f"Failed to import NostrClient module: {e}")
-    logger.error(traceback.format_exc())  # Log full traceback
-
 __all__ = ["NostrClient"]
+
+
+def __getattr__(name: str):
+    if name == "NostrClient":
+        return import_module(".client", __name__).NostrClient
+    raise AttributeError(f"module '{__name__}' has no attribute '{name}'")