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/config.py

@@ -9,6 +9,8 @@ from __future__ import annotations
 import os
 from pathlib import Path
 
+from .env_utils import env_bool
+
 
 def _int_env(name: str, default: int) -> int:
     try:
@@ -55,13 +57,15 @@ MAX_FILTER_ATTEMPTS = _int_env("MAX_FILTER_ATTEMPTS", 8)
 # Longest edge after preprocess (ImageMagick). Keeps rembg/gmic sane on
 # large camera JPEGs.
 MAX_EDGE_PX = _int_env("MAX_EDGE_PX", 2000)
+# ImageMagick preprocess step timeout (resize + orient).
+PREPROCESS_TIMEOUT = _int_env("PREPROCESS_TIMEOUT", 120)
 # Generous on purpose: the very first rembg call also downloads the model,
 # which can take a while depending on the link.
 REMBG_TIMEOUT = _int_env("REMBG_TIMEOUT", 600)
 # birefnet-general OOMs on the ~8GB event box; u2net + alpha matting fits
 # and is the practical equivalent of `rembg i -a`.
 REMBG_MODEL = os.environ.get("REMBG_MODEL", "u2net")
-REMBG_ALPHA = os.environ.get("REMBG_ALPHA", "1").strip().lower() in {"1", "true", "yes", "on"}
+REMBG_ALPHA = env_bool("REMBG_ALPHA", True)
 NICE_LEVEL = _int_env("NICE_LEVEL", 18)
 
 # gmic CLI binary, override for local dev if not on PATH. rembg has no