Btrfs: árvores atuais, mapa livre e arquivos apagados em versões antigas de nós; extensões comprimidas (zlib, zstd, lzo)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/guara-core/src/scan.rs

@@ -147,6 +147,7 @@ pub fn run(
                     FsKind::Exfat => Some(fs::exfat::scan(&mut ctx, p.start)),
                     FsKind::Ext => Some(fs::ext::scan(&mut ctx, p.start, p.len)),
                     FsKind::HfsPlus => Some(fs::hfsplus::scan(&mut ctx, p.start, p.len)),
+                    FsKind::Btrfs => Some(fs::btrfs::scan(&mut ctx, p.start, p.len)),
                     _ => None,
                 };
                 let _ = progress_phase;