[WIP] Add OpenAI MCP /search and /fetch endpoints for ChatGPT Connector compatibility and document usage in README

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original description:

Add OpenAI MCP compatibility for ChatGPT Connectors by implementing new /search and /fetch endpoints in the Python backend (likely in src/). These endpoints must:

• Accept POST requests as per OpenAI MCP documentation
• Use the existing PostgreSQL querying logic to provide results
• Return responses in the JSON schema required by OpenAI MCP
• Be fully backward compatible (do not remove or change existing SSE or legacy endpoints)
• Share logic with current endpoints where appropriate (e.g., via shared internal functions)

Additionally, update README.md to document:

• The new /search and /fetch endpoints (including example request/response bodies)
• How to configure this project as an MCP server for OpenAI/ChatGPT Connectors, including any necessary environment variables or API keys
• How to test the integration with OpenAI’s Connector UI or API

All new/modified code should follow existing code organization and style. Place new code in src/ or appropriate subdirectories. Do not break existing API or SSE clients. Include a migration notice in the README for users wishing to enable OpenAI MCP compatibility.

This pull request was created as a result of the following prompt from Copilot chat.

Add OpenAI MCP compatibility for ChatGPT Connectors by implementing new /search and /fetch endpoints in the Python backend (likely in src/). These endpoints must:

• Accept POST requests as per OpenAI MCP documentation
• Use the existing PostgreSQL querying logic to provide results
• Return responses in the JSON schema required by OpenAI MCP
• Be fully backward compatible (do not remove or change existing SSE or legacy endpoints)
• Share logic with current endpoints where appropriate (e.g., via shared internal functions)

Additionally, update README.md to document:

• The new /search and /fetch endpoints (including example request/response bodies)
• How to configure this project as an MCP server for OpenAI/ChatGPT Connectors, including any necessary environment variables or API keys
• How to test the integration with OpenAI’s Connector UI or API

All new/modified code should follow existing code organization and style. Place new code in src/ or appropriate subdirectories. Do not break existing API or SSE clients. Include a migration notice in the README for users wishing to enable OpenAI MCP compatibility.

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