FOLLOW-UP: Add --with-authz to interactive TUI (from PR #273)

[adnaan]

Context

This follow-up task was identified during the review of PR #273.

Source PR: #273
PR Title: feat: add authorization / RBAC system (Roadmap 2.3)
Suggested by: @claude[bot]

Task Description

The interactive lvt gen resource UI (Bubble Tea TUI) hardcodes withAuthz: false. The --with-authz flag is only available via CLI. Either add a checkbox/toggle to the interactive flow or document that --with-authz is CLI-only.

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