v0.1.0 - First public documentation and site baseline

First public documentation and site baseline.

Added

• Published the static website.
• Built the documentation shell and architecture overview.
• Added architecture documentation pages.
• Built the multilingual documentation experience.

Changed

• Completed Chinese documentation localization.
• Fixed Chinese architecture navigation and production Chinese TOC heading.
• Refreshed the project README and license.

Anchors

• Website: ephemeral-sandbox-website@4bfcc62
• Core baseline: ephemeral-sandbox@0bc6a7090