refactor(ebook-search): simplify search and phrase matching

python/ebook_search/config.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-from os import getenv
 from typing import Annotated, Self
 
 from pydantic import AliasChoices, Field, field_validator, model_validator
@@ -32,11 +31,6 @@ def normalize_embedding_alias(model: str) -> str:
     return standard_model
 
 
-def normalize_embedding_model(default: str = "qwen3-embedding-0.6b") -> str:
-    """Normalize the configured embedding alias to its provider model name."""
-    return normalize_embedding_alias(getenv("EBOOK_SEARCH_EMBEDDING_MODEL", default))
-
-
 class RerankConfig(BaseSettings):
     """vLLM reranker settings."""