Update .gitattributes and .gitignore: add video LFS, align indentation, fix ignore conflict

.gitattributes

@@ -7,6 +7,15 @@
 *.npy  filter=lfs diff=lfs merge=lfs -text
 *.npz  filter=lfs diff=lfs merge=lfs -text
 
+# Video data: LFS
+*.mp4  filter=lfs diff=lfs merge=lfs -text
+*.avi  filter=lfs diff=lfs merge=lfs -text
+*.mov  filter=lfs diff=lfs merge=lfs -text
+*.mkv  filter=lfs diff=lfs merge=lfs -text
+*.webm filter=lfs diff=lfs merge=lfs -text
+*.wmv  filter=lfs diff=lfs merge=lfs -text
+*.flv  filter=lfs diff=lfs merge=lfs -text
+
 # Image data: binary
 *.png       binary
 *.jpg       binary

.gitignore

@@ -1,10 +1,3 @@
-# Large dataset directories (由 Git LFS 或外部管理)
-data/
-datasets/
-*.tar
-*.tar.gz
-*.zip
-
 # Python
 __pycache__/
 *.py[cod]