feat: adopt the AromaNexus project identity

[rastagan-git]

Summary

• Adopt AromaNexus as the project and repository identity.
• Publish aromanexus as the primary Python distribution, import namespace, and CLI.
• Rename the Codex workflow skill from curate-flavor-data to curate-aroma-data.
• Update bilingual documentation, package metadata, cache locations, repository URLs, and the research-client user agent.
• Bump the package version from 0.2.0 to 0.3.0.

Maintainer README edits

This branch starts from the latest main after the maintainer's direct edits to both README.md and README-CN.md. Those deletions are preserved; the rename does not restore or overwrite the removed paragraphs.

Compatibility

• Keep flavor-data as a console alias for aromanexus.
• Keep the complete flavor_data_crawler namespace as forwarding modules.
• Keep python -m flavor_data_crawler.cli functional.
• Keep all four original Python scripts and Windows launchers.
• Reuse legacy default cache directories when present and continue accepting the old cache environment variables.

Validation

• ruff check .
• ruff format --check .
• pytest -q — 52 passed
• Official skill validator — passed
• Primary and legacy CLI smoke tests — passed
• Editable install and pip check — passed
• Wheel build — aromanexus-0.3.0-py3-none-any.whl
• Wheel contents verified to include both the primary and compatibility namespaces
• Independent skill forward test — passed without network or output writes

Closes #3