Fixed camera spin due to lag; fixed several bugs.

● Improved the camera rotation algorithm to prevent player misoperation caused by screen spin during lag.

● Fixed a bug where initial character perks did not take effect.

● Fixed a bug where wooden debris generated on the ground after demolishing a house could not be broken.

● Increased the health restored by food.

● Slightly increased the chance of digging up sand. However, the main source of sand remains the desert.

● Fixed a bug where players often heard zombies digging but could not find where the zombies were.

● Increased the amount of logs obtained from felling trees.

● Fixed a bug where players would acquire corresponding loot when zombies destroyed walls of abandoned buildings.

● Fixed a bug where loading a save got stuck due to a missing asset index.

● Fixed a “null key” bug in the dictionary of the digging system.

● Fixed a bug where data was modified inside an iterator in the object pool.