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Add real TEI embedding client for semantic tool discovery (#3844)

* Add real TEI embedding client for semantic tool discovery

Introduce a TEIClient that calls the HuggingFace Text Embeddings Inference
HTTP API for vector embeddings, replacing the need for fake/deterministic
embeddings in production. The store factory now selects between a real TEI
client (when a service URL is configured), a fake client (for testing), or
FTS5-only search.

Wire the full OptimizerConfig through the server instead of a boolean flag,
so the embedding service URL and timeout are available when creating the
store and client.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Addressed comments - passed OptimizerConfig to teiclient and simplified EmbeddingClient init

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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