refactor: Remove FastAPI implementation and add OpenAPI generator

[Septimus4]

Checklist

• [x] poetry run pytest passes locally with my changes
• [x] Tests have been added or updated to cover the changes
• [x] Documentation has been updated as needed
• [x] Code style checks pass
• [x] Commit messages follow the Conventional Commits guidelines

Affected Components

Description of Changes

Removed the FastAPI implementation including server files, tests for concord API. Integrated new OpenAPI generator configurations and model schemas to replace existing API functionality. This transition aims to streamline development and maintain consistency in API structure.

Implement boiler code for webserver generated form openapi generator Adds Bruno (postman alternative) to the test folder

Additional Notes