fix: python virtual environment single node configurations

[SarahAsad23]

What changes were proposed in this PR?

This PR fixes the single-node deployment configuration for the Python Virtual Environments (PVE) feature.

Changes:

• Adds the missing /pve route to the single-node NGINX configuration.
• Updates PveManager to correctly locate the system requirements files during deployment.

Note: This fix applies only to the Release 1.2 implementation of the Python Virtual Environments feature. The feature has since been significantly refactored on main.

Any related issues, documentation, discussions?

Closes #5963.

How was this PR tested?

Tested in a deployment setting.

Was this PR authored or co-authored using generative AI tooling?

No.

[github-actions]

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Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @bobbai00
  You can notify them by mentioning @bobbai00 in a comment.

[github-actions]

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[xuang7]

Hi @SarahAsad23, it seems this PR has conflicts with the main branch. Could you resolve the conflicts and update the PR description?