[refactor](trx-rs): remove trx-ft8 C FFI crate, use trx-ftx directly

Delete trx-ft8 (C wrapper around ft8_lib + ft2_ldpc) and update
trx-server to depend on trx-ftx (pure Rust) directly. Removes
~2,900 lines of C code and all unsafe FFI.

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

src/trx-server/Cargo.toml

@@ -37,7 +37,7 @@ trx-core = { path = "../trx-core" }
 trx-aprs = { path = "../decoders/trx-aprs" }
 trx-cw = { path = "../decoders/trx-cw" }
 trx-decode-log = { path = "../decoders/trx-decode-log" }
-trx-ft8 = { path = "../decoders/trx-ft8" }
+trx-ftx = { path = "../decoders/trx-ftx" }
 trx-wspr = { path = "../decoders/trx-wspr" }
 trx-protocol = { path = "../trx-protocol" }
 trx-reporting = { path = "../trx-reporting" }

src/trx-server/src/audio.rs

@@ -36,7 +36,7 @@ use trx_core::decode::{
 use trx_core::rig::state::{RigMode, RigState};
 use trx_core::vchan::SharedVChanManager;
 use trx_cw::CwDecoder;
-use trx_ft8::Ft8Decoder;
+use trx_ftx::Ft8Decoder;
 use trx_vdes::VdesDecoder;
 use trx_wspr::WsprDecoder;
 use uuid::Uuid;
@@ -92,7 +92,7 @@ fn decode_ft2_window(
     decoder: &mut Ft8Decoder,
     samples: &[f32],
     max_results: usize,
-) -> Vec<trx_ft8::Ft8DecodeResult> {
+) -> Vec<trx_ftx::Ft8DecodeResult> {
     let window_samples = decoder.window_samples();
     if samples.len() < window_samples {
         return Vec::new();