fix(aprs): crash when enabling APRS with callsign set (foreground service type)

Root cause: user reported crash on enabling APRS with a callsign set
(empty callsign worked because the service stops early and never
reaches startForeground). Android 14+ requires the service to declare
foregroundServiceType when startForeground passes a type; the service
had none -> process died on toggle.

- Manifest: add android:foregroundServiceType="dataSync"
- AprsCard: use startForegroundService() for start/report actions
  (Android 8+ standard for foreground services)
- AprsForegroundService: try-catch around startForeground, fallback
  stopSelf instead of killing the process
- AprsReporter: passcode "-1" (APRSdroid "no auth" convention) also
  auto-computes from callsign
- Merged upstream 418a05e3 (zh wording fix, no conflicts)
Verified: compileDebugKotlin all modules BUILD SUCCESSFUL,
check_strings 9 files OK.

core/data/src/main/java/com/rtbishop/look4sat/core/data/aprs/AprsReporter.kt

@@ -91,7 +91,7 @@ class AprsReporter(
                 port = cfg.port,
                 callsign = cfg.callsign,
                 ssid = cfg.ssid,
-                passcode = cfg.passcode.toIntOrNull() ?: AprsPacket.passcode(cfg.callsign),
+                passcode = cfg.passcode.toIntOrNull()?.takeIf { it >= 0 } ?: AprsPacket.passcode(cfg.callsign),
                 version = "Look4Sat 4.5.4"
             ).also { client = it }
             if (!c.isConnected) c.connect()