[feat](trx-client): add audio TCP proxy with auto-reconnect

Connect to the server audio TCP port, relay RX Opus frames into a
broadcast channel and TX frames from an mpsc channel. Pass audio
channels to the HTTP frontend via set_audio_channels. Reconnects
with exponential backoff on disconnect.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/Cargo.toml

@@ -17,6 +17,7 @@ tracing-subscriber = { workspace = true }
 clap = { workspace = true, features = ["derive"] }
 dirs = "6"
 libloading = "0.8"
+bytes = "1"
 trx-core = { path = "../trx-core" }
 trx-frontend = { path = "trx-frontend" }
 trx-frontend-http = { path = "trx-frontend/trx-frontend-http" }