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]

Add a JSON tag for the Ollama model ID field

/api/show marshals OllamaCapabilitiesModelInfo directly, but ID has no JSON tag, so the response key is emitted as "ID" instead of a lowercase/snake_case API key. Clients that deserialize the show payload using Ollama-style field names (or strict schemas) will not see this identifier field, which can break model metadata parsing even though the endpoint returns 200.

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Project	Deployment	Actions	Updated (UTC)
ds2api	Ready	Preview, Comment	May 7, 2026 0:36am

[CJackHwang]

Thank you for your pull request! If it gets past Lint and Refactor Gate, I'll merge it first.

[CJackHwang]

Fine, Iet me handle it.