v2.3.0 — ollama-cuda batched concurrency + pibox v0.7.0

ollama-cuda
- Default OLLAMA_NUM_PARALLEL bumped 1 -> 50. One loaded model can now
  serve up to 50 concurrent requests on the same weights (continuous
  batching). Server-wide setting — caller is responsible for not
  blowing up VRAM with a big chat model on the same instance.
- Tunables documented in .env.example: OLLAMA_CUDA_NUM_PARALLEL,
  OLLAMA_CUDA_MAX_LOADED, OLLAMA_CUDA_KV_CACHE.

pibox
- psyb0t/pibox bumped v0.3.1 -> v0.7.0 (drop-in for aigate; only the
  OpenAI-compatible surface is used). Fixes the bind-mount .init-done
  bug that pinned pi to api.anthropic.com on recreate, plus picks up
  proper SSE streaming and the new jsonSchema/verbose envelopes for
  callers that hit pi's direct surface.