Add static resources to EverythingServer sample

[mikekistler]

This PR adds static resources to the EverythingServer sample. In the process, I modified the resource templates so they are clearly distinguished from the static resources.

Motivation and Context

This helps the EverythingServer live up to its name by supporting all the features in the MCP protocol.

How Has This Been Tested?

I tested this on my own branch with the Inspector.

Breaking Changes

No breaking 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

[mikekistler]

Thanks for the review @halter73. I've incorporated your suggestions and requested re-review.