🗑️ 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

pmoaudiocache/src/track_metadata.rs

@@ -1,5 +1,5 @@
 use std::sync::Arc;
-use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 use pmometadata::{MetadataError, MetadataResult, TrackMetadata};
 use serde_json::{Number, Value};