Steam Achievements & Pharmacy Improvements

This update improves pharmacy gameplay, adds Steam achievement integration, and brings a few quality-of-life improvements.

- Added Steam integration for all 23 achievements.
- Increased daily customer limits across pharmacies.
- Improved customer spawn timing to reduce waiting and make pharmacies feel more active.
- Made factory object highlights brighter and easier to see.

Thanks for playing Formula Z and for all the feedback. More improvements are on the way.