Add dbForge AI Assistant to AI Code Completion section

[ViktoriiaDevart]

🚀 Summary

✅ Checklist

• I have read the contribution guidelines
• The tool is AI-related and useful for developers
• I have added a short, clear description of the tool
• The link is not a duplicate of an existing one
• The title of the link is properly capitalized
• The link follows the Awesome List format (- [Tool Name](link) – description)
• My change does not include unrelated files or changes

📌 Why is this tool awesome?

dbForge AI Assistant is an AI-driven companion built to accelerate developers’ SQL workflows with context-aware query generation, natural-language-to-SQL conversion, smart query optimization, instant in-editor guidance, and other features.

🔗 Link

https://www.devart.com/dbforge/ai-assistant/

📝 Additional context