docs: document HiDrive mount and symbolic links in shell environment

Updated CLAUDE.md to document .zlogin configuration which:
- Mounts HiDrive storage at /mnt/hidrive
- Creates symbolic links for Documents, Pictures, Videos, and Music directories
  from HiDrive user path to home directory
- Cleaned up .zprofile (removed empty content)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.zprofile

@@ -1,2 +0,0 @@
-
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