Remove duplicate vr_monitor.py and fix imports

[Copilot]

Problem

The repository contained two nearly identical copies of vr_monitor.py:

• XLeVR/vr_monitor.py (canonical version with English comments)
• simulation/Maniskill/examples/vr_monitor.py (duplicate with Chinese comments)

This duplication created maintenance overhead and confusion about which file to use or modify. Additionally, the import paths in various scripts used hardcoded absolute paths that were system-specific (e.g., /home/vec/lerobot/mani_skill/examples), making the code non-portable.

Solution

This PR removes the duplicate file and updates all imports to use repository-relative paths:

1. Removed duplicate: Deleted simulation/Maniskill/examples/vr_monitor.py (387 lines)

2. Fixed imports: Updated demo_ctrl_action_ee_VR.py and 8_xlerobot_teleop_vr.py to use relative paths:

   repo_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "../.."))
   sys.path.insert(0, os.path.join(repo_root, "XLeVR"))
   from vr_monitor import VRMonitor

3. Updated documentation: Fixed both English and Chinese documentation to reflect the correct import pattern

Benefits

• ✅ Single source of truth for VR monitor code in XLeVR/vr_monitor.py
• ✅ Portable imports that work across different installations
• ✅ No more hardcoded system-specific paths
• ✅ Easier maintenance with no code duplication

All imports have been tested and verified to work correctly from both software/examples/ and simulation/Maniskill/examples/ directories.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Duplicate vr_monitor.py</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #3

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