The text2vec-transformers Docker service was removed in Jan 2026,
but retrieval_tools.py still used near_text() which requires it.
Now uses GPU embedder (BGE-M3) with near_vector() like flask_app.py.
Changes:
- Add GPU embedder singleton (get_gpu_embedder)
- search_chunks_handler: near_text → near_vector + BGE-M3
- search_summaries_handler: near_text → near_vector + BGE-M3
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>