[TASK] Add support to ChatGPT to the dotCMS MCP server

Task Title

Add support to ChatGPT to the dotCMS MCP server

Description

Add native ChatGPT integration to the dotCMS MCP server so users can leverage ChatGPT capabilities within MCP workflows.

Scope:

• Evaluate integration points within the MCP server (providers, commands, or tools).
• Provide configuration for API keys via secure env/config (no secrets in repo).
• Add basic ChatGPT operations (e.g., chat completion) with clear error handling and timeouts.
• Add minimal usage docs and examples for developers.

Acceptance Criteria

• Configuration mechanism exists to supply OpenAI credentials securely (env vars or secrets).
• A ChatGPT provider/tool is available within the MCP server and can be enabled/disabled.
• Can send a simple prompt and receive a response via a CLI or API path in local dev.
• Errors (timeouts, auth failures, rate limits) are handled and logged clearly.
• Basic README/docs updated with setup, configuration, and example usage.

Priority

Medium

Additional Context

N/A

Start by locating the MCP server's providers, commands, and tools, then identify the CLI or API path used for local development. Define the secure credential configuration, enable/disable behavior, basic prompt flow, error handling, and the README or docs updates needed to satisfy the listed acceptance criteria.