feature: add Windows support for workspace activation script

[HalcyonByh]

Description

This pull request adds robust Windows support for workspace activation in the QuantPits project. It introduces a PowerShell activation script (run_env.ps1) for Windows users, updates the workspace initialization logic to generate the appropriate activation script based on the operating system, and improves documentation to guide Windows users through setup and potential PowerShell execution issues.

Windows support and activation scripts:

• The init_workspace.py script now detects the operating system and creates either a run_env.sh (for Linux/macOS) or run_env.ps1 (for Windows) activation script, with OS-appropriate environment variable setup and user instructions. [1] [2]

Documentation improvements:

• The walkthrough documentation (docs/70_WALKTHROUGH.md) is updated to include instructions for using the new PowerShell activation script on Windows, including how to configure environment variables and how to resolve PowerShell script execution policy issues. [1] [2] [3]
• The workspace directory structure documentation now lists both run_env.sh (Linux) and run_env.ps1 (Windows) activation scripts.
• The data extraction command is updated to use --strip-components=1 for better directory structure after extraction.

Sample script addition:

• A sample run_env.ps1 activation script is added to the demo workspace for reference and ease of use by Windows PowerShell users.

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