openai-functions.md used to claim LocalAI tool calling worked only on
llama.cpp-compatible models. That was true when it was written; it's
not true now — vLLM (since PR #9328) and MLX/MLX-VLM both extract
structured tool calls from model output.
- openai-functions.md: new 'Supported backends' matrix covering
llama.cpp, vllm, vllm-omni, mlx, mlx-vlm, with the key distinction
that vllm needs an explicit tool_parser: option while mlx auto-
detects from the chat template. Reasoning content (think tags) is
extracted on the same set of backends. Added setup snippets for
both the vllm and mlx paths, and noted the gallery importer
pre-fills tool_parser:/reasoning_parser: for known families.
- compatibility-table.md: fix the stale 'Streaming: no' for vllm,
vllm-omni, mlx, mlx-vlm (all four support streaming now). Add
'Functions' to their capabilities. Also widen the MLX Acceleration
column to reflect the CPU/CUDA/Jetson L4T backends that already
exist in backend/index.yaml — 'Metal' on its own was misleading.
