fix: 修复意外回滚 minio 的健康检查判断逻辑

app/src/main/java/com/yiring/app/web/common/HealthController.java

@@ -63,8 +63,8 @@ public class HealthController {
 
         // MinIO
         try {
-            minio.isValid();
-            data.put("minio", "up");
+            boolean result = minio.isValid();
+            data.put("minio", result ? "up" : "down");
         } catch (Exception e) {
             log.error("[Health] minio usability fail: {}", e.getMessage());
             data.put("minio", "down: " + e.getMessage());