Examples fix: simpleStreamableHttp could not be ran from dist/

[KKonstantinov]

The simpleStreamableHttp example could not be ran after being built. Reason is the import referencing src/ as opposed to being a relative import.

Motivation and Context

simpleStreamableHttp can be built and ran as an example.

How Has This Been Tested?

Running simpleStreamableHttp after the fix.

Breaking Changes

None.

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

A very simple change really.