Add support to ChatGPT to the dotCMS MCP server

[fmontes]

This pull request updates the mcp-server to run as an HTTP server using Streamable HTTP transport, replacing the previous stdio-based approach. It introduces a new Express-based server implementation, updates environment variable handling (notably adding the PORT variable), and revises documentation and configuration examples to reflect these changes.

Core server architecture changes:

• Replaced the StdioServerTransport with StreamableHTTPServerTransport and implemented an Express server that handles /mcp POST, GET (SSE), and DELETE requests for session-based communication. Sessions are managed via a session ID, and the server now supports multiple concurrent sessions. (core-web/apps/mcp-server/src/main.ts) [1] [2] [3]
• Added new dependencies: express and @types/express to support the HTTP server. (core-web/apps/mcp-server/package.json)

Configuration and documentation updates:

• Added documentation for the new PORT environment variable, defaulting to 3000, and updated all example configurations to include it. (core-web/apps/mcp-server/README.md) [1] [2] [3] [4] [5]
• Updated usage instructions and examples to show how to start the server as an HTTP service and connect tools (like MCP Inspector and AI assistants) to http://localhost:3000/mcp instead of using stdio. (core-web/apps/mcp-server/README.md) [1] [2]

These changes modernize the MCP server, making it easier to integrate with clients and tools that communicate over HTTP, and improve session management and extensibility.

This PR fixes: #33430

[Copilot]

Pull Request Overview

This pull request modernizes the dotCMS MCP server by migrating from stdio-based communication to HTTP transport, enabling better integration with AI assistants like ChatGPT and web-based tools.

• Replaced StdioServerTransport with StreamableHTTPServerTransport and implemented an Express-based HTTP server
• Added session management capabilities to support multiple concurrent client connections
• Updated environment configuration to include a PORT variable with documentation and examples

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
core-web/apps/mcp-server/src/main.ts	Complete rewrite to implement HTTP server with Express, session management, and streamable transport
core-web/apps/mcp-server/package.json	Added Express dependencies for HTTP server functionality
core-web/apps/mcp-server/README.md	Updated documentation to reflect HTTP transport usage and added PORT environment variable

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