fix(editor): editor search docs

[kappa90]

Problem

The search_documentation tool in the editor is broken, as it doesn't need a system prompt. We also use the wrong model because Inkeep's docs are not updated.

Changes

• Allow blank system prompt in the API request
• Change Inkeep's model name

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

By calling the API locally.

[greptile-apps]

PR Summary

This PR fixes the broken search_documentation tool in the editor by addressing issues with system prompts and model naming for the Inkeep integration.

• Modified LLMProxyCompletionSerializer in products/editor/backend/api.py to allow blank system prompts with allow_blank=True
• Updated Inkeep model name from 'inkeep-qa' to 'inkeep-qa-expert' in both files for consistency
• Added model validation in InkeepProvider to check if the provided model ID is supported
• Changed parameter name in stream_response method from '_' to 'system' to properly recognize the system parameter
• Improved error handling in the Inkeep provider with specific error messages for API and unexpected errors

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