Sync network redesign repo state and cutover artifacts

pihole/bin/prepare_pd.sh

@@ -12,8 +12,21 @@ if [[ ! -f "$ENV_FILE" ]]; then
 fi
 
 set -a
-# shellcheck disable=SC1090
-source "$ENV_FILE"
+eval "$(python3 - "$ENV_FILE" <<'PY'
+from pathlib import Path
+import shlex
+import sys
+
+env_file = Path(sys.argv[1])
+for raw_line in env_file.read_text(encoding='utf-8').splitlines():
+    line = raw_line.strip()
+    if not line or line.startswith('#') or '=' not in line:
+        continue
+    key, value = line.split('=', 1)
+    value = value.strip().strip('"').strip("'")
+    print(f"{key.strip()}={shlex.quote(value)}")
+PY
+)"
 set +a
 
 required_vars=(