Add .gitattributes for Git LFS and file locks

- Добавлен файл .gitattributes
- Настроено LFS-отслеживание для медиа-ассетов (спрайты, аудио, модели, шрифты)
- Включена поддержка блокировки (lockable) для сцен (.unity), префабов (.prefab), ScriptableObject-ов (.asset) и аниматоров (.controller)

.gitattributes

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+# Unity LFS tracking
+*.png filter=lfs diff=lfs merge=lfs -text
+*.psd filter=lfs diff=lfs merge=lfs -text
+*.psb filter=lfs diff=lfs merge=lfs -text
+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.jpeg filter=lfs diff=lfs merge=lfs -text
+*.tga filter=lfs diff=lfs merge=lfs -text
+*.gif filter=lfs diff=lfs merge=lfs -text
+*.bmp filter=lfs diff=lfs merge=lfs -text
+*.tif filter=lfs diff=lfs merge=lfs -text
+*.tiff filter=lfs diff=lfs merge=lfs -text
+
+# 3D models
+*.fbx filter=lfs diff=lfs merge=lfs -text
+*.obj filter=lfs diff=lfs merge=lfs -text
+*.max filter=lfs diff=lfs merge=lfs -text
+*.blend filter=lfs diff=lfs merge=lfs -text
+
+# Audio
+*.wav filter=lfs diff=lfs merge=lfs -text
+*.mp3 filter=lfs diff=lfs merge=lfs -text
+*.ogg filter=lfs diff=lfs merge=lfs -text
+
+# Fonts
+*.ttf filter=lfs diff=lfs merge=lfs -text
+*.otf filter=lfs diff=lfs merge=lfs -text
+
+# Archives
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.rar filter=lfs diff=lfs merge=lfs -text
+*.7z filter=lfs diff=lfs merge=lfs -text
+
+# Video
+*.mp4 filter=lfs diff=lfs merge=lfs -text
+*.mov filter=lfs diff=lfs merge=lfs -text
+
+# Unity lockable files (LFS with lockable attribute)
+*.unity filter=lfs diff=lfs merge=lfs -text lockable
+*.prefab filter=lfs diff=lfs merge=lfs -text lockable
+*.asset filter=lfs diff=lfs merge=lfs -text lockable
+*.controller filter=lfs diff=lfs merge=lfs -text lockable