[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>

Cargo.lock

@@ -2607,9 +2607,17 @@ dependencies = [
  "trx-decode-log",
  "trx-ft8",
  "trx-protocol",
+ "trx-vdes",
  "trx-wspr",
 ]
 
+[[package]]
+name = "trx-vdes"
+version = "0.1.0"
+dependencies = [
+ "trx-core",
+]
+
 [[package]]
 name = "trx-wspr"
 version = "0.1.0"