refactor: share env-bool parsing and logging setup

env_utils.env_bool replaces duplicated truthy parsing in config and
rembg_cli. logging_config.configure_logging unifies entry-point setup.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/logging_config.py

@@ -0,0 +1,11 @@
+"""Shared logging setup for entry-point modules."""
+
+from __future__ import annotations
+
+import logging
+
+_LOG_FORMAT = "%(asctime)s %(levelname)s [%(name)s] %(message)s"
+
+
+def configure_logging(level: int = logging.INFO) -> None:
+    logging.basicConfig(level=level, format=_LOG_FORMAT)