stacklok / toolhive / 24655237604

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Add EmbeddingServiceManager for TEI container lifecycle (#4912)

Implements pkg/vmcp/cli/embedding_manager.go — the component that
manages the lifecycle of a HuggingFace Text Embeddings Inference (TEI)
container for the Tier 2 semantic optimizer in thv vmcp serve.

Key behaviours:
- Deterministic container naming: thv-embedding-<sha256(model)[:8]>
- Idempotent Start: reuses an already-running container (reads port
  from toolhive-port label) or deploys a new one with LabelAuxiliary
- Model cache persisted at ~/.toolhive/embedding-models → /data bind mount
- Health polling with exponential backoff (2 s → 30 s, factor 2),
  draining response bodies to allow connection reuse
- Stop is a no-op when this instance did not start the container
- ContainerFactory narrow interface enables full unit testing without
  a live container daemon

Closes #4884

Co-authored-by: taskbot <taskbot@users.noreply.github.com>

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