🚀 Optimise OpenHome playlist sync performance (-75% SOAP calls)

- Augmente le batch ReadList de 64 à 256 (-75% appels SOAP)
- Élimine les doubles appel à queue_snapshot() dans sync_queue()–50% appels SOAP en moins
- Introduit lcs_flags_optimized() pour élaguer préfixe/suffixes communs (LCS O(n) vs quadratique)
- Met en place un polling adaptatif : 500ms actif / 5s veille
- Factorise parse_duration() et invalidation de caches via méthodes utilitaires

pmocontrol/src/queue/mod.rs

@@ -15,6 +15,24 @@ pub(crate) use interne::InternalQueue;
 pub(crate) use openhome::OpenHomeQueue;
 
 use crate::{RendererInfo, errors::ControlPointError};
+use crate::music_renderer::time_utils::parse_time_flexible;
+
+/// Returns true if `new_dur` < `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
+/// Used to protect stream durations from decreasing for the same track.
+pub(super) fn stream_duration_decreased(old_dur: &str, new_dur: &str) -> bool {
+    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+        (Some(old_secs), Some(new_secs)) => new_secs < old_secs,
+        _ => false,
+    }
+}
+
+/// Returns true if `new_dur` > `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
+pub(super) fn stream_duration_increased(old_dur: &str, new_dur: &str) -> bool {
+    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+        (Some(old_secs), Some(new_secs)) => new_secs > old_secs,
+        _ => false,
+    }
+}
 
 pub trait QueueFromRendererInfo {
     fn from_renderer_info(renderer: &RendererInfo) -> Result<Self, ControlPointError>