Add the OpenAPI specs for the documentation

[Grouloo]

We need to write an OpenAPI-compliant JSON file to configure the swagger endpoint already in place.

ElysiaJS uses a static analyzer to parse the code and find the endpoints, but it cannot read endpoints with a path containing a wildcard (e.g. '/viticulture/vine-varieties*'), so we have to write the documentation for the table endpoints ourselves.

It should not be too much of a problem, as these endpoints all share the same base output. A LLM should be able to generate all of the missing documentation from a snippet and the list of available paths.

https://swagger.io/specification/v2/

https://elysiajs.com/plugins/swagger