Make it possible to use Summarize model in CKEditor

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Problem/Motivation

Currently the Summary plugin only allows LLM's - with the new Summarize method we should allow methods from that as well.

Proposed resolution

• Add the summary models to the list.
• Remove the prompt when summary shows up.
• Use the summary models on inference.

Remaining tasks

Optional: Other details as applicable (e.g., User interface changes, API changes, Data model changes)

AI usage (if applicable)

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[ ] AI Generated Code
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[ ] Vibe Coded
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