feat: #1 telemetry record/playback with auto-race detection

- TelemetryRecorder: manual + auto mode (IsRaceOn edge detection)
- TelemetryPlayer: timed packet replay into _handle_packet pipeline
- .tsr format: [uint32 elapsed_ms][uint32 len][bytes]
- Settings UI: start/stop, auto toggle, recording list, play button
- API: /record/*, /playback/*, /recordings

server/telemetry/listener.py

@@ -151,6 +151,10 @@ class TelemetryListener:
 
         self.forwarder.forward(data)
 
+        from server.api import _recorder
+        if _recorder and _recorder.is_recording:
+            _recorder.write_packet(data)
+
         td = None
         if self._parser:
             td = self._parser.parse(data, addr)