[enhancement ] improved gpt response by adding system prompt.

[nikam14]

Objective -
added a initial instruction to model for better response.
Why -
this way the result is enhanced.

[vercel]

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[greptile-apps]

PR Summary

This PR adds a system prompt to AI generation functions in the profile widget to provide consistent instructions for AI responses.

• Added generic system prompt "Be a friendly GitHub profile analyser" in lib/actions/ai-actions.ts which may conflict with generateRoast function's intended sarcastic tone
• Consider creating function-specific system prompts instead of using a single generic one, particularly for specialized functions like roasting
• Ensure the system prompt follows style guidelines in path/xyx_styleguide.md for AI interactions

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