feat: add Ollama API endpoints /api/version, /api/tags, /api/show for Copilot integration

[dinhnn]

Summary

This MR adds support for three essential Ollama API endpoints to enable seamless integration with Copilot:

• /api/version
• /api/tags
• /api/show

Changes

• Implemented GET /api/version to retrieve Ollama version info
• Implemented GET /api/tags to list available models
• Implemented POST /api/show to display model capabilities

Why

These endpoints are required for Copilot to:

• Verify Ollama compatibility
• Fetch available models for selection
• Retrieve model metadata for context handling

Testing

• Unit tests added for all three endpoints
• Verified Copilot integration in staging environment

API Examples

# Version
curl http://localhost:6011/api/version

# Tags
curl http://localhost:6011/api/tags

# Show  
curl http://localhost:6011/api/show -d '{
    "model":"deepseek-v4-flash"
}'

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Normalize models/-prefixed IDs before resolving

/api/show forwards payload.model directly into ResolveModel, which only accepts canonical model names or configured aliases. Inputs like "models/deepseek-v4-pro" therefore resolve to not found and return 404, even though they refer to supported models (this exact form is exercised in the added route tests). Any Copilot/Ollama client that sends prefixed model IDs will fail model capability discovery.

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Project	Deployment	Actions	Updated (UTC)
ds2api	Ready	Preview, Comment	May 7, 2026 5:28am