fix: update ctime on data commits (streaming and flush paths)

Author: XciD

src/flush.rs

@@ -275,6 +275,7 @@ async fn flush_batch(
             entry.size = size;
             entry.dirty = false;
             entry.mtime = now;
+            entry.ctime = now;
             entry.pending_deletes.clear();
         }
     }

src/virtual_fs/mod.rs

@@ -1859,7 +1859,9 @@ impl VirtualFs {
             entry.xet_hash = Some(file_info.hash().to_string());
             entry.size = file_info.file_size();
             entry.dirty = false;
-            entry.mtime = SystemTime::now();
+            let now = SystemTime::now();
+            entry.mtime = now;
+            entry.ctime = now;
             entry.pending_deletes.clear();
         }