Add agent ACARS f00b4r0 support and UI state sync

- Agent: Add _detect_acarsdec_fork() for f00b4r0/DragonOS support
- Agent: Use --output json:file, --rtlsdr, -m 256 for f00b4r0 fork
- UI: Add setAcarsRunning() to sync button state with agent
- UI: Add 'acars' to syncModeUI uiSetters map

static/js/core/agents.js

@@ -678,7 +678,8 @@ function syncModeUI(mode, isRunning, agentId = null) {
         'pager': 'setPagerRunning',
         'adsb': 'setADSBRunning',
         'wifi': 'setWiFiRunning',
-        'bluetooth': 'setBluetoothRunning'
+        'bluetooth': 'setBluetoothRunning',
+        'acars': 'setAcarsRunning'
     };
 
     const setterName = uiSetters[mode];