feat(chat): Add API to summarize chat messages

[nickvergessen]

☑️ Resolves

• API for AI generated unread messages summaries #13430

🧪 Testing locally

• General note: Cron jobs might be used, so if you wait for a response, make sure to run php cron.php couple of times locally.

Option 1: Testing app

• Enable the QA testing app (part of server repo): index.php/settings/apps/installed
• On Task: Summarize select Fake text2text summary task processing provider: index.php/settings/admin/ai
• Will always return a response starting with This is a fake summary and is also used by CI tests for the backend

Option 2: Integration OpenAI

• 👀 Be aware of the privacy leak in case your test data contains private information
• Enable the OpenAI and LocalAI integration app (clone from https://github.com/nextcloud/integration_openai): index.php/settings/apps/installed
• Go to https://console.groq.com/login and create a new account (I recommend to use email rather then GitHub)
• After sign-up go to https://console.groq.com/keys and "Create API key"
• Set OpenAI and LocalAI integration settings on index.php/settings/admin/ai#openai_prefs
  • Service URL: https://api.groq.com/openai/v1
  • Service Name: groq.com
  • Authentication method: API Key
  • API Key: Insert value from previous step
• On Task: Summarize select groq.com: index.php/settings/admin/ai

🛠️ API Checklist

🚧 Tasks

• Requires feat(testing): Add a fake summary task provider server#49176
• Don't expose capability without a provider
• Federation atm not supported

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not possible
• 📘 API documentation in docs/ has been updated or is not required
• 🔖 Capability is added or not needed

[Antreesy]

groq scheduled tasks are failing. but also tokk some time to wait, before they're staying in 'scheduled status'. Need to discuss how to handle these cases in UI.

But tested with Fake Processor, seems to work fine.

[nickvergessen]

/backport to stable30