feat: support http transport

[cdcabrera]

What is it?

• feat: support http transport

Notes

• adds the ability to flip between stdio and http
• adds additional http options for both cli and programmatic usage

   - http?: boolean;
   - port?: number;
   - host?: string;
   - allowedOrigins?: string[];
   - allowedHosts?: string[];
  

• killExisting flag if set, should kill an existing process running on if the following conditions are met: the same port AND is the PF MCP. this is a convenience setting discovered during code audit
  • If a process is found but it's not the same MCP server (doesn't match both 'dist/index.js' and '--http'), it throws an error instead of killing it. This prevents killing unrelated processes.

[cdcabrera]

Parallel branch for in-progress work, https://github.com/cdcabrera/patternfly-mcp/tree/20251201-http

Aiming for closing e2e tests out today