Add Cursor IDE support via /v1/models endpoint

[konard]

Summary

This PR implements support for Cursor IDE and other OpenAI-compatible clients by adding the /v1/models endpoint and comprehensive documentation.

Changes

• Add modelsController.js with GET /v1/models and GET /v1/models/:model endpoints
• Returns OpenAI-compatible model list from llmsConfig
• Filters out provider-specific variants (_go, _guo, etc.) to show unique models
• Properly categorizes models by owner (openai, anthropic, meta, deepseek, etc.)
• Add CURSOR_SETUP.md with detailed setup instructions for Cursor IDE users
• Update ARCHITECTURE.md to document new endpoints and Cursor compatibility
• Register modelsController in server.js

Implementation Details

/v1/models Endpoint

The endpoint returns a list of all available models in OpenAI-compatible format:

{
  "object": "list",
  "data": [
    {
      "id": "gpt-4o",
      "object": "model",
      "created": 1234567890,
      "owned_by": "openai"
    },
    ...
  ]
}

/v1/models/:model Endpoint

Returns information about a specific model, with proper 404 handling for non-existent models.

Benefits

• ✅ Full Cursor IDE compatibility
• ✅ Support for any OpenAI-compatible client
• ✅ Automatic model discovery
• ✅ Access to 40+ models from multiple providers
• ✅ Maintains backward compatibility with existing endpoints

Testing

• Syntax validation passed
• Code structure follows existing patterns
• OpenAI-compatible response format verified

Documentation

• Comprehensive Cursor setup guide in CURSOR_SETUP.md
• Updated ARCHITECTURE.md with endpoint documentation
• Includes troubleshooting section and examples

Related Issues

Closes link-assistant/master-plan#8

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