Update CHANGELOG for 0.57.0

[dcg-generated-docs]

Updates CHANGELOG.md for 0.57.0.

This PR was created automatically after publishing workflow_dispatch 28a3873.

[github-actions]

📚 Docs Preview: https://pr-3140.datamodel-code-generator.pages.dev

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 11 untouched benchmarks
⏩ 98 skipped benchmarks¹

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_{Comparing docs/changelog-0.57.0 (9af9214) with main (28a3873)}

Footnotes

1. 98 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (28a3873) to head (9af9214).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #3140   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           88        88           
  Lines        18583     18583           
  Branches      2145      2145           
=========================================
  Hits         18583     18583           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[github-actions]

Breaking Change Analysis

Result: No breaking changes detected

Reasoning: PR #3140 only modifies CHANGELOG.md (adding 0.57.0 release notes) and .github/workflows/changelog.yaml (adding workflow_dispatch support and switching to PR-based changelog updates). No source code, templates, CLI options, APIs, or default behaviors were changed. The breaking changes described within the CHANGELOG entry refer to other PRs (#3054) that were already merged separately. This PR is purely a documentation and CI workflow update.

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This analysis was performed by Claude Code Action