Add Swagger JSON endpoint

[AmineAfia]

TL;DR

Added a new endpoint to serve Swagger JSON file.

What changed?

• Introduced a new GET route /json in the API.
• This route serves the swagger.json file located in the ./docs directory.

How to test?

1. Start the API server.
2. Make a GET request to http://your-api-host/json.
3. Verify that the response is the contents of the swagger.json file.

Why make this change?

This change allows direct access to the Swagger JSON file, which can be useful for:

• Integrating with external tools that consume Swagger/OpenAPI specifications.
• Enabling developers to easily download and use the API documentation offline.
• Facilitating automated testing or documentation generation processes that require the raw Swagger JSON.

[AmineAfia]

• Add Swagger JSON endpoint #87 👈
• main

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