2025.02.18 Demo Regular Update

This update cost the surviving developers one serving of Cloud Dumplings.
Details are as follows:
1. Increased the amount of resources in some maps and reduced the difficulty of certain tasks.
2. Fixed a bug where materials placed in camp facilities would disappear after closing the pop-up window.
3. Adjusted the infection value growth curve after 200 days, slightly increasing the difficulty in the later stages.
4. Added sound effects for the flare gun.
5. Added a display showing the number of days until the next infection value speed change.
6. Added a new effect for zombie brains—now zombies have a chance to directly drop brains upon being killed.
7. Fixed a bug where the soap collection task could not be submitted and resolved display issues in certain languages.
8. Increased the drop rate of cement and limestone, and optimized some original art assets.
9. Removed some abnormal data from the game leaderboard.