refactor: enhance handler traits to support dynamic sizing and improve cancellation handling

apps/nxmesh-agent/src/service/master_handler/handlers.rs

@@ -17,14 +17,14 @@ pub trait OnConfigUpdateHandler: Send + Sync + 'static {
 
 pub struct HandlerImpl<OCH>
 where
-    OCH: OnConfigUpdateHandler,
+    OCH: OnConfigUpdateHandler + ?Sized,
 {
     on_config_update_handler: Arc<OCH>,
 }
 
 impl<OCH> HandlerImpl<OCH>
 where
-    OCH: OnConfigUpdateHandler,
+    OCH: OnConfigUpdateHandler + ?Sized,
 {
     pub fn new(on_config_update_handler: Arc<OCH>) -> Self {
         Self {
@@ -36,7 +36,7 @@ where
 #[async_trait::async_trait]
 impl<OCH> MasterMessageHandler for HandlerImpl<OCH>
 where
-    OCH: OnConfigUpdateHandler,
+    OCH: OnConfigUpdateHandler + ?Sized,
 {
     async fn handle_master_message(&self, message: MasterMessage) -> MessageResult<()> {
         match message.payload {