fix: update lofty 0.18 API calls to lofty 0.23

- Imports reorganized: use lofty::prelude::*, lofty::tag::*, lofty::picture::*
- Picture::new_unchecked -> Picture::unchecked().pic_type().mime_type().build()
- set_year/remove_year -> set_date/remove_date with Timestamp
- ItemKey::Unknown("ISRC") -> ItemKey::Isrc
- save_to_path(path) -> save_to_path(path, WriteOptions::default())
- get_string/remove_key now take ItemKey by value
- Bump qbz-library crate lofty dep to 0.23

cc

crates/qbz-library/Cargo.toml

@@ -24,7 +24,7 @@ walkdir = "2"
 dirs = "5"
 
 # Audio metadata
-lofty = "0.18"
+lofty = "0.23"
 
 # Image processing (thumbnails)
 image = { version = "0.25", default-features = false, features = ["png", "jpeg", "webp"] }