Add OpenAPI templates for medium and large scale projects

[muumuu8181]

This PR introduces OpenAPI templates to facilitate API design for medium and large-scale projects.

Changes

• Created openapi_templates/medium:
  • Contains openapi.yaml, paths/, and components/.
  • Suitable for projects needing separation but low complexity.
• Created openapi_templates/large:
  • Contains openapi.yaml, domains/, and shared/.
  • Follows DDD principles, allowing independent domain development.
• Added openapi_templates/README.md:
  • Documentation on how to use and bundle the templates (e.g., with swagger-cli or redocly).

Verification

• Verified file structure and content manually.
• Confirmed JSON pointers and relative references work correctly.

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PR created automatically by Jules for task 2224369189124134972 started by @muumuu8181

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