docs: rewrite the next documentation from code evidence

[suiramdev]

Summary

This change writes the 22 pages of next again from evidence in the code. Six inventories list each fact with its source file or the command that showed it. Look at docs/audit/docs-plan.md first, then at get-started/install.mdx.

Motivation

• The old pages had about 20 statements that the code contradicts.
• Some facts were on two pages, and the two copies did not agree.
• Some links on next pointed at main, and those files are not on main. The links gave HTTP 404.
• All pages had the same <title> and no meta description.

Drawbacks

• The rewrite changes almost all of next, so the diff is large.
• next links point at dev. The snapshot pins them to the tag at release.
• Four review rounds ran. Only round 1 used a different model.

Prior art

• The first pass corrected the old pages. It did not write them again.
• A generated procedure reference needs .output() and .errors() in packages/api. That is a code change, so it is not in this PR.

Notes

• Visual change: each docs page now has its own <title> and meta description.
• Tests: none added. docs:check --strict, the build, types:check and env:check pass.
• Docs: all 22 next pages. The 0.1 folder did not change.
• UI text: assistant_model_none_chosen and onboarding_country_description changed in en.json and fr.json.
• Not tested: the Dokploy and Coolify panels, a real bank, email delivery, external sign-in, passkeys.
• A maintainer must answer the questions in docs/audit/docs-plan.md.

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