feat(cli): add chat command for accessing interface

[libing0526]

Where:

• type is one of: feat, fix, docs, refactor, perf, test, chore.
• scope is optional and describes the part of the codebase affected (e.g., auth, ui, api).
• concise message is a short description of the change (max 50 chars).

📝 Change Type

Please select the type of change this PR introduces (choose one or more):

• feat: New feature.
• fix: Bug fix.
• docs: Documentation only changes.
• refactor: A code change that neither fixes a bug nor adds a feature.
• perf: Performance improvement.
• test: Adding missing tests or correcting existing tests.
• chore: Maintenance tasks (e.g., updating dependencies).

💡 Description

Add new chat command to Windows Parallax CLI for accessing chat interface from non-scheduler computers. This command provides seamless integration with the underlying Parallax chat functionality, supporting parameter pass-through and automatic environment setup.

Key Changes

1. New ModelChatCommand class: Implemented complete chat command with WSL integration and proxy support
2. Command registration: Added chat command to the CLI command parser system
3. Documentation updates: Updated README.md with comprehensive chat command usage examples and descriptions
4. Parameter pass-through: Full support for all parallax chat arguments including scheduler address and host configuration

🔗 Related Issues

List any issues this PR closes or relates to:

• Implements chat interface access feature for Windows CLI
• Enhances distributed inference cluster accessibility

✅ Checklist

Please ensure the following points are addressed before merging:

• I have performed a self-review of my own code.
• I have added/updated tests that prove my fix or feature works (if applicable).
• I have updated the documentation (if necessary).
• My code follows the project's style guidelines.
• Code compiles successfully without errors
• Chat command appears in help output and works correctly
• All existing functionality remains unaffected