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>

.zlogin

@@ -0,0 +1,9 @@
+HIDRIVE=/mnt/hidrive
+HIDRIVE_VALKNAR="$HIDRIVE/users/valknar"
+
+mount "$HIDRIVE" 2>/dev/null
+
+ln -s "$HIDRIVE_VALKNAR/Documents" "$HOME/Documents" 2>/dev/null
+ln -s "$HIDRIVE_VALKNAR/Pictures" "$HOME/Pictures" 2>/dev/null
+ln -s "$HIDRIVE_VALKNAR/Videos" "$HOME/Videos" 2>/dev/null
+ln -s "$HIDRIVE_VALKNAR/Music" "$HOME/Music" 2>/dev/null