added password lock

app.py

@@ -26,6 +26,16 @@ if not OPEN_ROUTER_KEY:
     st.warning("Please enter your OpenRouter API Key to proceed.")
     st.stop()
 
+try:
+    pswdVal = st.experimental_get_query_params()['pwd'][0]
+    if pswdVal==st.secrets["PSWD"]:
+        isPswdValid = True
+except:
+    pass
+
+if not isPswdValid:
+    st.write("Invalid Password")
+
 def call_openrouter(content: str) -> str:
     """Send a chat request to OpenRouter and return a safe string response."""
     try: