[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-server/trx-backend/trx-backend-soapysdr/src/dsp.rs

@@ -299,6 +299,7 @@ impl SdrPipeline {
 
 pub const IQ_BLOCK_SIZE: usize = 4096;
 
+#[allow(clippy::too_many_arguments)]
 fn iq_read_loop(
     mut source: Box<dyn IqSource>,
     sdr_sample_rate: u32,