Fix lua@latest resolving to all instead of the newest Lua release

[Copilot]

lua@latest could resolve to the manifest’s all entry, which led the plugin to download lua-all.tar.gz and fail during install. This change makes latest resolve from real Lua release versions only.

• Version resolution

  • Filter pseudo-versions such as all out of the available-version list exposed by the plugin.
  • Keep explicit manifest lookups unchanged so direct version installs continue to use the existing manifest data.

• Regression coverage

  • Add a focused Linux E2E case for vfox install lua@latest so the latest path is exercised directly.

for line in string.gmatch(resp.body, '([^\n]+)') do
    local version, checksum = parse_version_line(line)
    if version and checksum and string.match(version, "^%d") then
        table.insert(result, {
            version = version,
            checksum = checksum
        })
    end
end

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