[fix](trx-rs): resolve all clippy warnings

- remote_client tests: add missing server_connected field and import
  AtomicBool in the test module
- pskreporter: replace map_or(true, …) with is_none_or and
  repeat(x).take(n) with repeat_n(x, n)
- dsp.rs, scheduler.rs: suppress intentional too_many_arguments with
  #[allow(clippy::too_many_arguments)]

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/trx-frontend/trx-frontend-http/src/scheduler.rs

@@ -411,6 +411,7 @@ pub struct SchedulerStatus {
     pub last_bookmark_ids: Vec<String>,
 }
 
+#[allow(clippy::too_many_arguments)]
 async fn apply_scheduler_target(
     rig_tx: &mpsc::Sender<RigRequest>,
     rig_id: &str,