fix: lower macos minimum version for packaging

Author: Dimillian

Scripts/package_app.sh

@@ -7,7 +7,7 @@ cd "$ROOT"
 
 APP_NAME=${APP_NAME:-CodexSkillManager}
 BUNDLE_ID=${BUNDLE_ID:-com.dimillian.codexskillmanager}
-MACOS_MIN_VERSION=${MACOS_MIN_VERSION:-26.0}
+MACOS_MIN_VERSION=${MACOS_MIN_VERSION:-15.0}
 MENU_BAR_APP=${MENU_BAR_APP:-0}
 SIGNING_MODE=${SIGNING_MODE:-}
 APP_IDENTITY=${APP_IDENTITY:-}