fix(model): inline ServerDetail fields in PublishRequest (#62)

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Inline ServerDetail fields in PublishRequest

## Motivation and Context
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Fix #55 

## How Has This Been Tested?
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tested? -->

## Breaking Changes
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## Types of changes
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the boxes that apply: -->
- [x] 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
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that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed

## Additional context
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94c19fafa4/scripts/test_publish.sh (L61-L102)

---------

Co-authored-by: Avinash Sridhar <sridharavinash@users.noreply.github.com>

tools/publisher/main.go

@@ -294,9 +294,7 @@ func publishToRegistry(registryURL string, mcpData []byte, token string) error {
 	}
 
 	// Create the publish request payload (without authentication)
-	publishReq := map[string]interface{}{
-		"server_detail": mcpDetails,
-	}
+	publishReq := mcpDetails
 
 	// Convert the request to JSON
 	jsonData, err := json.Marshal(publishReq)