docs(web): remove Fledge Alpha Free from Zen docs

[dc85]

Issue for this PR

N/A

Type of change

• Documentation

What does this PR do?

Removes Fledge Alpha Free (fledge-alpha-free) from the Zen docs and all translations: the endpoint table row, pricing table row, free-model note, and privacy note.

How did you verify your code works?

git grep -i fledge packages/web/src/content returns no matches.

Screenshots / recordings

N/A — docs content.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[opencode-agent]

Thanks for keeping the Zen docs up to date, @dc85! The dev branch (v1) only takes critical fixes, and this change only touches docs, so this bot is closing the pull request. If maintainers want the Zen model tables updated on dev, they can reopen it.