Update llm_groq.py

llm_groq.py

@@ -1,5 +1,5 @@
 import os
-from typing import List, Dict, Optional
+from typing import List, Dict
 
 try:
     from groq import Groq
@@ -11,7 +11,7 @@ DEFAULT_MODEL = "llama-3.3-70b-versatile"
 def get_client() -> "Groq":
     api_key = os.getenv("GROQ_API_KEY")
     if not api_key:
-        raise RuntimeError("Missing GROQ_API_KEY (set in Space → Settings → Variables & Secrets).")
+        raise RuntimeError("Missing GROQ_API_KEY. Set it in Space → Settings → Variables & Secrets.")
     if Groq is None:
         raise RuntimeError("Package 'groq' not installed. Add 'groq' to requirements.txt.")
     return Groq(api_key=api_key)