feat(server): model remote compute driver endpoints

[elezar]

Summary

Builds on NVIDIA#1703 by modeling remote compute drivers as named endpoint-backed drivers instead of a single external socket side channel.

Related Issue

Contribution against NVIDIA#1703.

Changes

• Normalize compute driver names and store remote driver Unix socket endpoints by driver name.
• Route VM and unmanaged remote drivers through the same acquired endpoint path.
• Forward template.driver_config.<name> for custom remote driver names.
• Document remote endpoint driver configuration and socket ownership expectations.

Testing

• mise run check passes
• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

mise run pre-commit was attempted but timed out after 180s. Before timeout it reported a Helm lint failure for the existing chart dependency metadata: chart metadata is missing these dependencies: postgresql. Rust/Python checks reached by the run were passing, and mise run check completed successfully.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)