Auto-generate OpenAPI spec from API code/router

[KokaKiwi]

Context

We need to manually update and fix the OpenAPI spec JSON whenever we change the API endpoints (spent like 5/6+ hours fixing it for the edgee-api-client crate)

To Do

• Auto-generate the OpenAPI spec JSON from API code/router
  • An endpoint /openapi.json in the API?

How To

• https://github.com/gofiber/swagger

Definition of Done

• Have a way to get the OpenAPI spec JSON autogenerated from the API
• Remove the manually updated openapi.json