chore(release): prepare v0.12.0

[nao1215]

Changed

• multipartkit/form.add_field, add_file, add_field_strict, and
  add_file_strict now have labelled arguments (name:, value:,
  filename:, content_type:, body:) so builder chains read like
  the rest of the Gleam ecosystem. Source-compatible: existing
  positional callers continue to work unchanged. (form.add_field/add_file/_strict variants take positional args — labels would match the builder-chain ergonomic #47)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 325f07f7-3dcc-48d6-bfbe-ff5e9fcb7719

📥 Commits

Reviewing files that changed from the base of the PR and between bdcffe8 and 356d6c2.

📒 Files selected for processing (2)

• CHANGELOG.md
• gleam.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.12.0

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