fix: 🐛 can't establish sse when server side enable compress

[Exlau]

Add "no-transform" cache-control header for sse.

Motivation and Context

sse can't established when server side enable compress like gzip.

How Has This Been Tested?

locally.

Breaking Changes

no braking changes.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

no more.

[jspahrsummers]

Thanks!