changing the api keys reading

app.py

@@ -24,7 +24,7 @@ def init_resources():
     # Try to load from environment variables first (for Spaces)
     llm_api_key = os.getenv("SAMBANOVA_API_KEY")
     website = os.getenv("WEBSITE")
-    embedding_model_name = os.getenv("EMBEDDING_MODEL", "sentence-transformers/all-MiniLM-L6-v2")
+    embedding_model_name = os.getenv("EMBED_MODEL", "sentence-transformers/all-MiniLM-L6-v2")
     system_prompt = os.getenv("SYSTEM_PROMPT", "You are a helpful assistant.")
 
     # Fallback to config.yaml if env vars not set