Make is_valid_pk() async to use tokio::time::sleep

Changed is_valid_pk() from sync to async to properly wait for file
creation without blocking. This is a breaking change but we're in
active development.

Changes:
- is_valid_pk() signature: fn -> async fn
- Replaced std:🧵:sleep with tokio::time::sleep
- Updated all 6 call sites in pmoplaylist to add .await:
  - WriteHandle::push()
  - WriteHandle::push_set()
  - ReadHandle::pop()
  - ReadHandle::peek()
  - ReadHandle::remaining()
  - ReadHandle::get_all()

Benefits:
- Non-blocking wait for file creation during ingestion
- More idiomatic async Rust code
- Better integration with tokio runtime

pmoplaylist/src/handle/read.rs

@@ -51,7 +51,7 @@ impl ReadHandle {
 
             // Vérifier validité dans le cache
             let cache = crate::manager::audio_cache()?;
-            if cache.is_valid_pk(&cache_pk) {
+            if cache.is_valid_pk(&cache_pk).await {
                 // Valide, avancer le curseur et retourner
                 self.cursor.fetch_add(1, Ordering::SeqCst);
                 return Ok(Some(PlaylistTrack::new(cache_pk)));
@@ -92,7 +92,7 @@ impl ReadHandle {
             Some(record) => {
                 // Vérifier validité
                 let cache = crate::manager::audio_cache()?;
-                if cache.is_valid_pk(&record.cache_pk) {
+                if cache.is_valid_pk(&record.cache_pk).await {
                     Ok(Some(PlaylistTrack::new(record.cache_pk.clone())))
                 } else {
                     Ok(None)
@@ -125,7 +125,7 @@ impl ReadHandle {
 
         for i in pos..core.len() {
             if let Some(record) = core.get(i) {
-                if cache.is_valid_pk(&record.cache_pk) {
+                if cache.is_valid_pk(&record.cache_pk).await {
                     count += 1;
                 }
             }
@@ -200,7 +200,7 @@ impl ReadHandle {
             };
 
             // Vérifier validité
-            if !cache.is_valid_pk(&record.cache_pk) {
+            if !cache.is_valid_pk(&record.cache_pk).await {
                 continue;
             }
 

pmoplaylist/src/handle/write.rs

@@ -30,7 +30,7 @@ impl WriteHandle {
 
         // Vérifier que le pk existe dans le cache
         let cache = crate::manager::audio_cache()?;
-        if !cache.is_valid_pk(&cache_pk) {
+        if !cache.is_valid_pk(&cache_pk).await {
             return Err(crate::Error::CacheEntryNotFound(cache_pk));
         }
 
@@ -59,7 +59,7 @@ impl WriteHandle {
         // Vérifier tous les pks d'abord
         let cache = crate::manager::audio_cache()?;
         for pk in &cache_pks {
-            if !cache.is_valid_pk(pk) {
+            if !cache.is_valid_pk(pk).await {
                 return Err(crate::Error::CacheEntryNotFound(pk.clone()));
             }
         }