fix(embeddings): remove fallback for BGE-M3

backend/hue_portal/core/embeddings.py

@@ -46,7 +46,7 @@ AVAILABLE_MODELS = {
 #   - EMBEDDING_MODEL=username/private-model (private HF model, requires HF_TOKEN)
 DEFAULT_MODEL_NAME = os.environ.get(
     "EMBEDDING_MODEL",
-    AVAILABLE_MODELS.get("bge-m3", AVAILABLE_MODELS.get("multilingual-e5-base", "intfloat/multilingual-e5-base"))
+    AVAILABLE_MODELS.get("bge-m3", "BAAI/bge-m3")  # BGE-M3 is default, no fallback
 )
 FALLBACK_MODEL_NAME = AVAILABLE_MODELS.get("paraphrase-multilingual", "sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2")