feat: Add VHF DSC Channel 70 monitoring and decoding

- Implement DSC message decoding (Distress, Urgency, Safety, Routine)

- Add MMSI country identification via MID lookup

- Integrate position extraction and map markers for distress alerts

- Implement device conflict detection to prevent SDR collisions with AIS

- Add permanent storage for critical alerts and visual UI overlays

bin/dsc-decoder

@@ -0,0 +1,13 @@
+#!/bin/bash
+# DSC (Digital Selective Calling) decoder wrapper
+# Invokes the Python DSC decoder module
+
+# Get the directory where this script is located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+# Set PYTHONPATH to include project root
+export PYTHONPATH="${PROJECT_ROOT}:${PYTHONPATH}"
+
+# Run the decoder module
+exec python3 -m utils.dsc.decoder "$@"