macOS Time Machine AFP monitoring: backup_time update on file modification

- Added afp_monitor.rs module to track AFP_AfpInfo backup_time
- Open struct now has 'modified' flag to track file modifications
- write.rs sets modified=true on successful write
- close.rs calls AfpMonitor::update_backup_time() on modified files
- create.rs calls AfpMonitor::init_afp_info() on new file creation
- AFP_AfpInfo stored as xattr com.apple.aapl.AfpInfo
- backup_time updated to current epoch time on modification

Also includes:
- LZ4 compression using lz4_flex crate
- Case sensitivity conditional on backend capabilities
- LDAP cfg feature gate fix
- RAID rebuild reconstruction implementation
- DOS attributes xattr persistence
- Snapshot disk persistence

Tests: 201 smb-server, 452 markbase-core (653 total)

vendor/smb-server/src/tests/dynamic_config.rs

@@ -38,7 +38,7 @@ async fn register_session(
     ));
     state.active_connections.register(&conn).await;
 
-    let session = Session::new(1, identity, [0; 16], [0; 16], None, false, false, None);
+    let session = Session::new(1, identity, [0; 16], [0; 16], None, false, false, None, None);
     let session = Arc::new(tokio::sync::RwLock::new(session));
     let share = state.find_share(share_name).await.expect("share");
     let tree = Arc::new(tokio::sync::RwLock::new(TreeConnect::new(