20250919 Game Update

[h3]Optimization and Fixes[/h3]

• Added selection mechanism for base vehicles.
  
• Optimized special effects shadows in the farm tutorial level.
  
• Fixed the bug where the guide line disappears.
  
• Fixed the bug where two base vehicles appear in the farm tutorial level.
  
• Fixed the bug where flamethrower soldiers' attacks are restricted while standing on scaffolding.
  
• Fixed the abnormal bug that occurs when pulling walls consecutively.
  
• Optimized map design.
  
• Fixed the bug where tasks were not displaying correctly.
  
• Optimized description text for some buildings.
  
• Fixed the bug where motorcycles couldn't attack in certain situations.
  
• Adjusted the sound volume for some units.