[fix](trx-rs): increase JSON line limit to 256KB for large sat pass responses

GetSatPasses responses with 100+ satellites easily exceed the previous
16KB limit, causing the remote client to disconnect.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-server/src/listener.rs

@@ -34,7 +34,7 @@ use crate::rig_handle::RigHandle;
 
 const IO_TIMEOUT: Duration = Duration::from_secs(10);
 const REQUEST_TIMEOUT: Duration = Duration::from_secs(12);
-const MAX_JSON_LINE_BYTES: usize = 16 * 1024;
+const MAX_JSON_LINE_BYTES: usize = 256 * 1024;
 /// Run the JSON TCP listener, accepting client connections.
 ///
 /// `rigs` is a shared map from rig_id → `RigHandle`.  The first entry (by