feat(copilot): copilot mcp + server side copilot execution

[Sg312]

Summary

• Moves copilot tool execution and stream handling to server side
• Adds copilot mcp
• Adds tools for copilot to debug and discover

Type of Change

• Bug fix
• New feature

Testing

Tested with @icecrasher321

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[Sg312]

@cursor review

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