fix: Add #[async_trait] to RadioParadiseExt to eliminate warning

Add async_trait annotation to RadioParadiseExt trait and its implementation
to suppress the "async fn in public traits" warning.

This is the recommended approach for traits with async methods as it ensures
proper Future bounds (Send) are generated.

pmoparadise/src/pmoserver_ext.rs

@@ -5,6 +5,7 @@
 
 use crate::channels::{max_channel_id, ChannelDescriptor, ALL_CHANNELS};
 use crate::{Block, NowPlaying, RadioParadiseClient};
+use async_trait::async_trait;
 use axum::{
     extract::{Path, Query, State},
     http::StatusCode,
@@ -352,6 +353,7 @@ pub fn create_api_router(state: RadioParadiseState) -> Router {
 ///
 /// Permet d'initialiser Radio Paradise avec routes HTTP complètes
 #[cfg(feature = "pmoserver")]
+#[async_trait]
 pub trait RadioParadiseExt {
     /// Initialise l'API Radio Paradise
     ///
@@ -366,6 +368,7 @@ pub trait RadioParadiseExt {
 }
 
 #[cfg(feature = "pmoserver")]
+#[async_trait]
 impl RadioParadiseExt for pmoserver::Server {
     async fn init_radioparadise(&mut self) -> anyhow::Result<RadioParadiseState> {
         let state = RadioParadiseState::new().await?;