v0.30.0: OnlineSource forwards the disc title to the key service

OnlineSource::query() now includes the disc's volume_label (UDF/ISO volume id)
as a plain-text `title` field in the /decode POST, so the key service can build
a disc_hash → title catalog from real rips. Depends on libfreemkv 0.30.

src/keydb.rs

@@ -127,6 +127,7 @@ mod tests {
             mkb: Vec::new(),
             unit_key_ro: Vec::new(),
             samples: Vec::new(),
+            volume_label: None,
         }
     }