[WIP] Refactor virtual environment handling in endend.py

[Copilot]

• Analyze existing virtual environment handling section (lines 84-338)
• Simplify validate_virtual_environment - reduce dictionary-based issue reporting
• Streamline find_existing_virtual_environments - remove complex priority sorting
• Simplify create_virtual_environment - wrap python -m venv concisely
• Simplify repair_virtual_environment - remove backup logic, just delete and recreate
• Refactor setup_virtual_environment - orchestrate with minimal boilerplate
• Remove excessive print statements and comments
• Verify syntax is correct with Python
• Run code review
• Run security check with CodeQL

Original prompt

Refactor endend.py to significantly reduce the number of lines in the virtual environment handling section (approximately lines 84-338).

Objectives:

1. Simplify Validation: Rewrite validate_virtual_environment to perform essential checks (existence of Scripts/python.exe and activate.bat) more concisely. Remove the detailed dictionary-based issue reporting if it complicates the code excessively.
2. Streamline Discovery: Simplify find_existing_virtual_environments to list directories that pass the simplified validation. Remove complex priority sorting if it adds unnecessary bulk.
3. Concise Creation & Repair:
   • Simplify create_virtual_environment to wrap python -m venv.
   • Simplify repair_virtual_environment to simply remove the corrupted directory and call create, potentially removing the backup logic to save lines if it's not critical, or implementing it more tersely.
4. Unified Setup Flow: Refactor setup_virtual_environment to orchestrate these steps with minimal boilerplate.
5. General Cleanup: Remove excessive print statements or comments that clutter the code in this section.

The goal is to make the script more maintainable and shorter while keeping the core feature: allowing the user to select an existing valid venv or create a new one.

This pull request was created as a result of the following prompt from Copilot chat.

Refactor endend.py to significantly reduce the number of lines in the virtual environment handling section (approximately lines 84-338).

Objectives:

1. Simplify Validation: Rewrite validate_virtual_environment to perform essential checks (existence of Scripts/python.exe and activate.bat) more concisely. Remove the detailed dictionary-based issue reporting if it complicates the code excessively.
2. Streamline Discovery: Simplify find_existing_virtual_environments to list directories that pass the simplified validation. Remove complex priority sorting if it adds unnecessary bulk.
3. Concise Creation & Repair:
   • Simplify create_virtual_environment to wrap python -m venv.
   • Simplify repair_virtual_environment to simply remove the corrupted directory and call create, potentially removing the backup logic to save lines if it's not critical, or implementing it more tersely.
4. Unified Setup Flow: Refactor setup_virtual_environment to orchestrate these steps with minimal boilerplate.
5. General Cleanup: Remove excessive print statements or comments that clutter the code in this section.

The goal is to make the script more maintainable and shorter while keeping the core feature: allowing the user to select an existing valid venv or create a new one.

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