chore: add dev feature and API development docs

[xiaoyijun]

Summary

Add documentation for dev feature development workflow and API development checklist:

• docs/dev-feature.md - How to work with dev features in Logto

  • Usage in Core package (EnvSet.values.isDevFeaturesEnabled)
  • Usage in Console package (@/consts/env)
  • Usage in integration tests (devFeatureTest / devFeatureDisabledTest)
  • OpenAPI documentation with "Dev feature" tag
  • Custom operation IDs in devFeatureCustomRoutes
  • Graduation checklist

• docs/api-development-checklist.md - Checklist for API development

  • Route definition
  • Custom operation ID configuration
  • OpenAPI documentation requirements
  • Common errors and solutions

Testing

N/A

Checklist

• .changeset
• unit tests
• integration tests
• necessary TSDoc comments

[github-actions]

COMPARE TO master

Total Size Diff 📈 +8.4 KB

Diff by File

Name	Diff
docs/api-development-checklist.md	📈 +4.15 KB
docs/dev-feature.md	📈 +4.25 KB