🗑️ Remove unused imports and format code

- Comment out `use std::simd::*` in pmoaudio as it's unused and modules import their own SIMD
- Remove `Instant` from imports in track_metadata.rs (unused)
- Reorder anyhow import to match Rust convention (`anyhow, Result` → `Result`) and remove unused imports
- Improve XML response logging readability with line breaks in iterator chain
+ Refactor `get()` method to multi-line for clarity and consistency

pmoaudio/src/lib.rs

@@ -78,7 +78,7 @@ async fn main() {
 - **RwLock** : Pour partage concurrent du compteur [`TimerNode`]
 "#]
 #[cfg(feature = "simd")]
-use std::simd::*;
+// use std::simd::*; // Not actually used in this file, modules import their own simd
 
 mod audio_chunk;
 mod audio_segment;