api: Use Huma to generate swagger docs and parse JSON automatically (#262)

## Motivation and Context

Currently there's a lot of unsafe manual JSON unmarshalling/marshalling,
and we have to manually keep the openapi schema in sync.

This PR migrates the API to
[Huma](https://github.com/danielgtaylor/huma), which appears like a
popular, well-maintained way to build APIs in Golang. I'm not a Golang
expert, but seemed highly recommended by Reddit + Claude and has a
decent star count. It provides automatic openapi spec generation and
docs hosting, JSON parsing, as well as the ability to add auth
middlewares etc.

## How Has This Been Tested?

Running locally, and poking at the endpoints

## Breaking Changes

Docs are served at `/docs` rather than `/v0/swagger/index.html` now

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [x] Breaking change (fix or feature that would cause existing
functionality to change)
- [x] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
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
<!-- Add any other context, implementation notes, or design decisions
-->

internal/database/memory.go

@@ -234,10 +234,13 @@ func (db *MemoryDB) Publish(ctx context.Context, serverDetail *model.ServerDetai
 		return ErrInvalidInput
 	}
 
-	// Generate a new ID for the server detail
+	// Always generate a new UUID for the ID
 	serverDetail.ID = uuid.New().String()
 	serverDetail.VersionDetail.IsLatest = true // Assume the new version is the latest
-	serverDetail.VersionDetail.ReleaseDate = time.Now().Format(time.RFC3339)
+	// Only set ReleaseDate if it's not already provided
+	if serverDetail.VersionDetail.ReleaseDate == "" {
+		serverDetail.VersionDetail.ReleaseDate = time.Now().Format(time.RFC3339)
+	}
 	// Store a copy of the entire ServerDetail
 	serverDetailCopy := *serverDetail
 	db.entries[serverDetail.ID] = &serverDetailCopy