Add Ollama-compatible API endpoints and model capability support

[CJackHwang]

Motivation

• Expose an Ollama-compatible surface so clients can query version, model tags and model capabilities via /api/version, /api/tags, and /api/show.
• Ensure Ollama responses use lowercase id and include capabilities for compatibility with strict schemas and Ollama-style clients.

Description

• Added Ollama docs to API.en.md and API.md describing the new endpoints and example payloads for POST /api/show.
• Implemented Ollama HTTP handlers in internal/httpapi/ollama/handler_routes.go providing GetVersion, ListOllamaModels, and GetOllamaModel and improved request body closing with a slog warning on failure.
• Extended model configuration types in internal/config/models.go by adding JSON tags for Ollama capability objects and ensured mapping to Ollama model structs via mapToOllamaModels and appendNoThinkingVariants.
• Updated tests in internal/httpapi/ollama/handler_routes_test.go to assert valid JSON responses and that the response exposes a lowercase id (and does not expose uppercase ID).

Testing

• Ran the Ollama handler tests with go test ./internal/httpapi/ollama and they succeeded.
• Ran package-level unit tests for the modified handlers and model mapping which also passed.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
ds2api	Ready	Preview, Comment	May 7, 2026 5:12pm