[bug]: Context chat query fails

[kyteinsky]

Context Chat task failed. Error in Log AppApi not installed, while screen shots show it as installed. I deactivated it, uninstalled it and now I get again this error:

  | RuntimeException Error during request to ExApp (context_chat_backend): cURL error 6: Could not resolve host: context_chat_backend (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://context_chat_backend:23000/query LanguageModel call using provider Nextcloud Assistant Context Chat Provider failed -- | --

Originally posted by @anolting in #390

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Describe the bug
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To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Server logs (if applicable)

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Context Chat Backend logs (if applicable, from the docker container)

<paste logs here or attach a file>

Screenshots
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Setup Details (please complete the following information):

• Nextcloud Version: [eg. 28.0.1, master]
• AppAPI Version: [eg. 2.0.1]
• Context Chat PHP Version [e.g. 1.0.0]
• Context Chat Backend Version [e.g. 1.0.0]
• Nextcloud deployment method: [eg. Apache bare-metal]
• Context Chat Backend deployment method: [eg. manual, one-click]

Additional context
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[kyteinsky]

@anolting Would you mind, filling up the details in the above form, including the raw server and container logs.