[feat](trx-rs): add VDES decoder mode support

Add a new trx-vdes decoder path alongside AIS, wire VDES through the server/frontend decode pipeline, and fix the web map so AIS vessel symbols load correctly and the TRX receiver marker appears when location data arrives.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-server/trx-backend/trx-backend-soapysdr/src/demod.rs

@@ -156,7 +156,7 @@ impl Demodulator {
             RigMode::AM => Self::Am,
             RigMode::FM => Self::Fm,
             RigMode::WFM => Self::Wfm,
-            RigMode::AIS => Self::Fm,
+            RigMode::AIS | RigMode::VDES => Self::Fm,
             RigMode::CW | RigMode::CWR => Self::Cw,
             RigMode::DIG => Self::Passthrough,
             // VHF/UHF packet radio (APRS, AX.25) is FM-encoded AFSK.

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

@@ -44,7 +44,7 @@ fn default_bandwidth_for_mode(mode: &RigMode) -> u32 {
         RigMode::AM => 9_000,
         RigMode::FM => 12_500,
         RigMode::WFM => 180_000,
-        RigMode::AIS => 25_000,
+        RigMode::AIS | RigMode::VDES => 25_000,
         RigMode::Other(_) => 3_000,
     }
 }

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

@@ -57,7 +57,7 @@ impl SoapySdrRig {
     fn default_bandwidth_for_mode(mode: &RigMode) -> u32 {
         match mode {
             RigMode::LSB | RigMode::USB | RigMode::DIG => 3_000,
-            RigMode::PKT | RigMode::AIS => 25_000,
+            RigMode::PKT | RigMode::AIS | RigMode::VDES => 25_000,
             RigMode::CW | RigMode::CWR => 500,
             RigMode::AM => 9_000,
             RigMode::FM => 12_500,
@@ -192,6 +192,7 @@ impl SoapySdrRig {
                     RigMode::WFM,
                     RigMode::FM,
                     RigMode::AIS,
+                    RigMode::VDES,
                     RigMode::DIG,
                     RigMode::PKT,
                 ],
@@ -352,7 +353,7 @@ impl RigCat for SoapySdrRig {
             let half_span_hz = i128::from(self.pipeline.sdr_sample_rate) / 2;
             let current_center_hz = i128::from(self.center_hz);
             let target_lo_hz = i128::from(freq.hz);
-            let target_hi_hz = if self.mode == RigMode::AIS {
+            let target_hi_hz = if matches!(self.mode, RigMode::AIS | RigMode::VDES) {
                 i128::from(freq.hz) + i128::from(AIS_CHANNEL_SPACING_HZ)
             } else {
                 i128::from(freq.hz)