Match Go read_super_block: apply replication override from .vif

seaweed-volume/src/storage/volume.rs

@@ -912,6 +912,14 @@ impl Volume {
         }
 
         self.super_block = SuperBlock::from_bytes(&full_buf)?;
+
+        // Match Go: if volumeInfo.Replication is set, override super block's ReplicaPlacement
+        if !self.volume_info.replication.is_empty() {
+            if let Ok(rp) = ReplicaPlacement::from_string(&self.volume_info.replication) {
+                self.super_block.replica_placement = rp;
+            }
+        }
+
         Ok(())
     }