debug: add WARN logging to SeaweedOutputStream base constructor

CRITICAL: None of our higher-level logging is appearing!
- NO SeaweedFileSystemStore.createFile logs
- NO SeaweedHadoopOutputStream constructor logs
- NO FSDataOutputStream.getPos() override logs

But we DO see:
- WARN SeaweedOutputStream: PARQUET FILE WRITTEN (from close())

Adding WARN log to base SeaweedOutputStream constructor will tell us:
1. IF streams are being created through our code at all
2. If YES, we can trace the call stack
3. If NO, streams are being created through a completely different mechanism
   (maybe Hadoop is caching/reusing FileSystem instances with old code)

other/java/client/src/main/java/seaweedfs/client/SeaweedOutputStream.java

@@ -47,6 +47,8 @@ public class SeaweedOutputStream extends OutputStream {
 
     public SeaweedOutputStream(FilerClient filerClient, final String path, FilerProto.Entry.Builder entry,
             final long position, final int bufferSize, final String replication) {
+        LOG.warn("[DEBUG-2024] SeaweedOutputStream BASE constructor called: path={} position={} bufferSize={}", 
+                path, position, bufferSize);
         this.filerClient = filerClient;
         this.replication = replication;
         this.path = path;