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)

markbase-core/src/vfs/raid.rs

@@ -109,15 +109,57 @@ impl VfsRaidBackend {
         (offset / self.stripe_size as u64) as usize % self.backends.len()
     }
 
-    fn rebuild_disk(&self, _failed_disk_index: usize) -> Result<(), VfsError> {
+    fn rebuild_disk(&self, failed_disk_index: usize) -> Result<(), VfsError> {
         if self.config.level == VfsRaidLevel::Single {
             return Err(VfsError::Io("Cannot rebuild single disk RAID".to_string()));
         }
 
-        for backend in &self.backends {
-            backend.create_dir_all(&PathBuf::from("/"), 0o755)?;
+        if failed_disk_index >= self.backends.len() {
+            return Err(VfsError::Io(format!("Invalid disk index {}", failed_disk_index)));
         }
 
+        let source_index = if self.backends.len() > 1 {
+            // Use backends[0] as source if failed_disk_index != 0, else use backends[1]
+            if failed_disk_index != 0 { 0 } else { 1 }
+        } else {
+            return Err(VfsError::Io("Not enough disks for rebuild".to_string()));
+        };
+
+        let target_backend = &self.backends[failed_disk_index];
+        let source_backend = &self.backends[source_index];
+
+        target_backend.create_dir_all(&PathBuf::from("/"), 0o755)?;
+
+        self.rebuild_recursive(source_backend, target_backend, &PathBuf::from("/"))?;
+
+        Ok(())
+    }
+
+    fn rebuild_recursive(
+        &self,
+        source: &Box<dyn VfsBackend>,
+        target: &Box<dyn VfsBackend>,
+        path: &Path,
+    ) -> Result<(), VfsError> {
+        let entries = source.read_dir(path)?;
+        for entry in &entries {
+            let entry_path = path.join(&entry.name);
+            if entry.stat.is_dir {
+                target.create_dir_all(&entry_path, entry.stat.mode)?;
+                self.rebuild_recursive(source, target, &entry_path)?;
+            } else {
+                let mut src_file = source.open_file(&entry_path, &super::open_flags::OpenFlags::new().read())?;
+                let data = src_file.read_all()?;
+                let mut dst_file = target.open_file(
+                    &entry_path,
+                    &super::open_flags::OpenFlags::new().write().create().truncate(),
+                )?;
+                dst_file.write_all(&data)?;
+                if let Ok(stat) = source.stat(&entry_path) {
+                    target.set_stat(&entry_path, &stat)?;
+                }
+            }
+        }
         Ok(())
     }
 }