Bun Compatibility & API Key Authorisation

[r4yfon]

• added bun compatibility so that commands for bun can be run instead of npm
• added authorisation for api to allow only certain calls to work. mitigates usage concerns

[hnthap]

@r4yfon

Hi! Thanks for the contribution. I am interested in the API Key authentication, but I cannot merge this as is.

Could you please make the following changes?

1. Revert the Bun changes: Please revert package.json and .gitignore to use npm and Node.js. I do not want to switch the project to Bun.
2. Make Auth Optional: Can you update apiKeyAuth.ts so that if no API_KEY environment variable is set, the API remains open? It should only enforce auth if the variable exists.
3. Remove the file Sending: It looks like an accidental commit.

Let me know if you can make these updates!