1.0.0: docs(readme): restructure the guide in vi, en and ja

At a glance with an overview diagram, a table of contents, installation from the command line, uninstall,
license, a "Conditions & Rules" section grouped by step and a Q&A. Menu and button names now match the
screens; the customer fields list the kana name fields.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>