feat: OpenAI Custom Headers/Params and Debug Page

[michael-genson]

What type of PR is this?

(REQUIRED)

• documentation
• feature

What this PR does / why we need it:

(REQUIRED)

This PR adds a few customization options to the OpenAI config to allow for more custom integrations (e.g. with Azure OpenAI). It also adds an admin OpenAI debug page (I also moved the parser debug page there):

Optionally you can provide an image:

And here's an error (I added the word "test" to the end of my API key):

Which issue(s) this PR fixes:

(REQUIRED)

Fixes #4119

Special notes for your reviewer:

(fill-in or delete this section)

Testing

(fill-in or delete this section)

Manually

[Kuchenpirat]

Looks all good to me.
OpenAI debugging does work as expected. I have no way of real-world testing custom headers and params but the implementation makes sense to me and i hope we have some people testing that out in nightly for us.

[AntoineBriseboisRoy]

I tried testing custom params this morning. I can't figure out the required format to put in my docker-compose since it is not specified in the doc. I think it would be important to include an exemple in the doc.

Can you give me a hint here? ;)

[Kuchenpirat]

I tried testing custom params this morning. I can't figure out the required format to put in my docker-compose since it is not specified in the doc. I think it would be important to include an exemple in the doc.

Can you give me a hint here? ;)

There is an example in the docs in the backend config page on the openai section.
https://docs.mealie.io/documentation/getting-started/installation/backend-config/#openai

OPENAI_CUSTOM_PARAMS='{"k1": "v1", "k2": "v2"}'