fix: variable name

app.py

@@ -13,7 +13,10 @@ MODEL_OPTIONS = {
 EVALUATION_MODEL = "qwen/qwen3-32b:free"
 
 #Load the open router api
-OPENROUTERAI_API_KEY = os.getenv("OPENROUTERAI")
+OPENROUTER_API_KEY = os.getenv("OPENROUTERAI")
+if not OPENROUTER_API_KEY:
+    raise RuntimeError("Missing OpenRouter API key. Please set OPENROUTERAI in your environment variables.")
+
 
 # API query function
 def query_openrouter(prompt, model_id):