test: Add asset listing test for embedded frontend assets

Co-authored-by: Copilot <copilot@github.com>

apps/nxmesh-master/src/routes/frontend/mod.rs

@@ -73,6 +73,16 @@ async fn get_file_handler(
 mod tests {
     use super::*;
 
+    #[tokio::test]
+    async fn test_asset() {
+        // list all embedded assets for debugging
+        let assets = FrontendAssets::iter().collect::<Vec<_>>();
+        assert!(
+            !assets.is_empty(),
+            "Expected to find embedded assets, but found none"
+        );
+    }
+
     #[tokio::test]
     async fn test_get_index_html() {
         let index_html = get_index_html();