Fix: Add missing DEFAULT_SYSTEM_PROMPT variable

app.py

@@ -3,7 +3,8 @@ import os
 from huggingface_hub import InferenceClient
 
 # Model configuration - Using Inference API
-MODEL_NAME = "mistralai/Mistral-7B-Instruct-v0.3"# Initialize Inference Client
+MODEL_NAME = "mistralai/Mistral-7B-Instruct-v0.
+DEFAULT_SYSTEM_PROMPT = "You are a helpful AI assistant powered by Mistral."
 client = None
 
 def init_client():