* Fix prompt template bugs in build and search
Bug 1: Build template ignored in new format
- Updated compute_embeddings_openai() to read build_prompt_template or prompt_template
- Updated compute_embeddings_ollama() with same fix
- Maintains backward compatibility with old single-template format
Bug 2: Runtime override not wired up
- Wired CLI search to pass provider_options to searcher.search()
- Enables runtime template override during search via --embedding-prompt-template
All 42 prompt template tests passing.
Fixes#155
* Fix: Prevent embedding server from applying templates during search
- Filter out all prompt templates (build_prompt_template, query_prompt_template, prompt_template) from provider_options when launching embedding server during search
- Templates are already applied in compute_query_embedding() before server call
- Prevents double-templating and ensures runtime override works correctly
This fixes the issue where --embedding-prompt-template during search was ignored because the server was applying build_prompt_template instead.
* Format code with ruff
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