Add root landing page support and package static assets

tests/root_landing_tests.rs

@@ -0,0 +1,43 @@
+use axum::http::StatusCode;
+use bzod::web::pages::root_landing;
+use std::fs;
+
+#[tokio::test]
+async fn test_root_landing_page() {
+    // --- Test case 1: Successful serving ---
+    // Read expected content
+    let expected_content = fs::read_to_string("www/index.html").expect("www/index.html must exist for test");
+
+    let response = root_landing().await;
+
+    assert_eq!(response.status(), StatusCode::OK);
+    assert!(
+        response.headers().get("content-type").unwrap().to_str().unwrap().contains("text/html")
+    );
+
+    // Convert response body to bytes using axum::body::to_bytes
+    let body_bytes = axum::body::to_bytes(response.into_body(), usize::MAX)
+        .await
+        .unwrap();
+    let body_str = String::from_utf8(body_bytes.to_vec()).unwrap();
+    assert_eq!(body_str, expected_content);
+
+    // --- Test case 2: File Not Found fallback ---
+    // Temporarily rename www/index.html to simulate file not found
+    let orig_path = "www/index.html";
+    let temp_path = "www/index.html.tmp_test_bak";
+    fs::rename(orig_path, temp_path).unwrap();
+
+    let response_res = tokio::spawn(async move {
+        root_landing().await
+    }).await;
+
+    // Restore index.html immediately in case of panic/error
+    let rename_res = fs::rename(temp_path, orig_path);
+    
+    // Now verify the response status
+    let response = response_res.unwrap();
+    assert_eq!(response.status(), StatusCode::NOT_FOUND);
+
+    rename_res.unwrap();
+}