Add auth to admin dashboard for HF deployment

admin.py

@@ -416,8 +416,12 @@ with gr.Blocks(
 
 
 if __name__ == "__main__":
+    admin_user = os.getenv("ADMIN_USERNAME", "admin")
+    admin_pass = os.getenv("ADMIN_PASSWORD", "hr-intervals-2026")
+
     demo.launch(
         server_name="0.0.0.0",
         server_port=7861,
-        share=False
+        share=False,
+        auth=(admin_user, admin_pass),
     )