[refactor](trx-server): access soapysdr through trx-backend facade

Remove direct dependency on trx-backend-soapysdr from server Cargo.toml.
Re-export SoapySdrRig from trx-backend instead so server accesses it
through the proper facade. This keeps sub-backends internal to trx-backend
and maintains proper module organization.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/trx-server/Cargo.toml

@@ -27,7 +27,6 @@ cpal = "0.15"
 opus = "0.3"
 trx-app = { path = "../trx-app" }
 trx-backend = { path = "trx-backend", features = ["soapysdr"] }
-trx-backend-soapysdr = { path = "trx-backend/trx-backend-soapysdr" }
 trx-core = { path = "../trx-core" }
 trx-aprs = { path = "../decoders/trx-aprs" }
 trx-cw = { path = "../decoders/trx-cw" }

src/trx-server/src/main.rs

@@ -278,7 +278,7 @@ fn build_sdr_rig_from_instance(
         })
         .collect();
 
-    let sdr_rig = trx_backend_soapysdr::SoapySdrRig::new_with_config(
+    let sdr_rig = trx_backend::SoapySdrRig::new_with_config(
         args,
         &channels,
         &rig_cfg.sdr.gain.mode,

src/trx-server/trx-backend/src/lib.rs

@@ -13,6 +13,8 @@ mod dummy;
 use trx_backend_ft450d::Ft450d;
 #[cfg(feature = "ft817")]
 use trx_backend_ft817::Ft817;
+#[cfg(feature = "soapysdr")]
+pub use trx_backend_soapysdr::SoapySdrRig;
 
 /// Connection details for instantiating a rig backend.
 #[derive(Debug, Clone)]