docs(local-llm): add Ollama setup, extraction evals, and env vars reference
- docs/02-ollama-setup-and-models.md: installation, server config, memory management,
idle timeout, manual load/unload, OpenAI-compatible API, native API reference,
performance tuning flags (flash attention, KV cache)
- docs/06-extraction-service-evals.md: promptfoo eval suite against Ollama, 19 cases
across 5 tasks, assertion patterns for JSON string output, Python sidecar config
- docs/09-environment-variables.md: comprehensive var reference for Ollama server,
evals, Python sidecar, dashboard, whisper CLI flags, proxy/network settings
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