debug: add logging to SeaweedFileSystemStore.createFile()

Critical diagnostic: Our FSDataOutputStream.getPos() override is NOT being called!

Adding WARN logs to SeaweedFileSystemStore.createFile() to determine:
1. Is createFile() being called at all?
2. If yes, but FSDataOutputStream override not called, then streams are
   being returned WITHOUT going through SeaweedFileSystem.create/append
3. This would explain why our position tracking fix has no effect

Hypothesis: SeaweedFileSystemStore.createFile() returns SeaweedHadoopOutputStream
directly, and it gets wrapped by something else (not our custom FSDataOutputStream).

other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java

@@ -179,6 +179,8 @@ public class SeaweedFileSystemStore {
 
         permission = permission == null ? FsPermission.getFileDefault() : permission;
 
+        LOG.warn("[DEBUG-2024] SeaweedFileSystemStore.createFile CALLED: path={} overwrite={} bufferSize={}", 
+            path, overwrite, bufferSize);
         LOG.debug("createFile path: {} overwrite: {} permission: {}",
             path,
             overwrite,
@@ -216,6 +218,8 @@ public class SeaweedFileSystemStore {
             SeaweedWrite.writeMeta(filerClient, getParentDirectory(path), entry);
         }
 
+        LOG.warn("[DEBUG-2024] SeaweedFileSystemStore.createFile RETURNING SeaweedHadoopOutputStream: path={} bufferSize={}", 
+            path, bufferSize);
         return new SeaweedHadoopOutputStream(filerClient, path.toString(), entry, writePosition, bufferSize, replication);
 
     }

other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedHadoopOutputStream.java

@@ -18,9 +18,9 @@ public class SeaweedHadoopOutputStream extends SeaweedOutputStream implements Sy
     private static final Logger LOG = LoggerFactory.getLogger(SeaweedHadoopOutputStream.class);
 
     public SeaweedHadoopOutputStream(FilerClient filerClient, final String path, FilerProto.Entry.Builder entry,
-                                     final long position, final int bufferSize, final String replication) {
+            final long position, final int bufferSize, final String replication) {
         super(filerClient, path, entry, position, bufferSize, replication);
-        LOG.warn("[DEBUG-2024] SeaweedHadoopOutputStream created: path={} position={} bufferSize={} replication={}", 
+        LOG.warn("[DEBUG-2024] SeaweedHadoopOutputStream created: path={} position={} bufferSize={} replication={}",
                 path, position, bufferSize, replication);
     }