feat(versions): include versions to CLI methods

[Ryank90]

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[Copilot]

Pull request overview

This PR expands the serverless “apps versions” surface area to support both listing versions and showing a single immutable version, aligning the CLI structure with the existing “builds” command pattern and adding the needed API client method.

Changes:

• Refactors serverless apps versions into a command group with list and show subcommands, including argument parsing/validation for versionNumber.
• Adds Client.GetVersion(...) to the serverless API client plus tests for success, not-found, and missing API key.
• Extends tabular output support with a single-version display shape and updates generated docs accordingly.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/cmd/serverless/display.go	Adds versionResult for single-version table/json/yaml output.
internal/cmd/serverless/display_test.go	Adds/adjusts tests for version display and versionNumber parsing.
internal/cmd/serverless/apps.go	Removes the old leaf versions command implementation (now provided by new file).
internal/cmd/serverless/apps_versions.go	Introduces versions group with list and show subcommands and parseVersionNumber.
internal/api/serverless/client.go	Adds GetVersion API client method with status-code handling and debug logging.
internal/api/serverless/client_test.go	Adds GetVersion test coverage (OK / 404 / no API key).
docs/runware_serverless_apps.md	Updates the apps command list description for the versions command.
docs/runware_serverless_apps_versions.md	Updates versions to a parent command and links to list/show.
docs/runware_serverless_apps_versions_show.md	Adds docs page for versions show.
docs/runware_serverless_apps_versions_list.md	Adds docs page for versions list.

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