feat(ext4): add device node support with mknod system call
- Implement device inode creation with proper device number encoding in i_block
- Add mknod system call handling for character/block devices and FIFOs
- Support both old (major/minor < 256) and new format device number encoding
- Add comprehensive test suite for mknod functionality
- Fix stat system call to properly handle device nodes
- Add device number utilities compatible with Linux ext4 format
Signed-off-by: xboHodx <xbohodx2024@gmail.com>
8b6f23a4a3