Adjusted the swing amplitude of the hands and feet to bring it closer to reality.

Adjusted the color brightness of Gordon Freddy's ears.

Slightly adjusted the brightness of the envmap of the hat and bow tie.

Fixed the issue that envmap did not work, slightly tweaked freddy's textures and used mipmaps.

Optimize file size.

Fixed the bug where the model was too dark in first-person view, and added the Golden Freddy skin.