feat(aprs): 4.5.4 APRS-IS network reporting (ported from APRSdroid 1.6.3d)

Core logic extracted from APRSdroid 1.6.3d (jadx reverse-engineered,
verified against APRS spec):
- core/domain/aprs/AprsPacket.kt: passcode algorithm (0x73E2 XOR),
  login line, uncompressed/compressed position encoding (ab0oo)
- core/data/aprs/AprsIsClient.kt: APRS-IS TCP client (login + packet
  lines, 30s reconnect strategy)
- core/data/aprs/AprsReporter.kt: periodic reporting scheduler
  (default 5 min, manual trigger support)
- core/data/aprs/AprsStore.kt: SharedPreferences persistence
  (fill once, saved)
- app/AprsForegroundService.kt: foreground service with notification
  (keeps APRS alive across pages), START_STICKY, last-known position
  provider
- feature/settings/AprsCard.kt: APRS card between DataCard and
  OutputCard, gear button opens settings dialog (server/port/
  callsign/ssid/passcode/interval/status/symbol), manual report button
- Manifest: service registration + FOREGROUND_SERVICE(_DATA_SYNC) +
  POST_NOTIFICATIONS
- Strings in EN/ZH/TR/IN/ID (23 keys x 5)
- Version 4.5.4/454 + What's new 5 languages

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/aprs/AprsPacket.kt

@@ -0,0 +1,116 @@
+package com.rtbishop.look4sat.core.domain.aprs
+
+import kotlin.math.abs
+import kotlin.math.round
+
+/**
+ * APRS-IS 协议核心(纯 Kotlin,无 Android 依赖)。
+ * 从 APRSdroid 1.6.3d 逆向移植:AprsPacket$.scala + ab0oo Position.java。
+ */
+object AprsPacket {
+
+    /** APRS-IS passcode 算法(标准):0x73E2 初值,呼号大写+\0,每对字符 XOR */
+    fun passcode(callsign: String): Int {
+        val s = callsign.split("-")[0].uppercase() + "\u0000"
+        var hash = 29666 // 0x73E2
+        var i = 0
+        while (i <= s.length - 2) {
+            hash = hash xor (s[i].code * 256 + s[i + 1].code)
+            i += 2
+        }
+        return hash and 0x7FFF
+    }
+
+    /** 登录行:user CALL-SSID pass XXXX vers XXXX */
+    fun formatLogin(callsign: String, ssid: String, passcode: Int, version: String): String {
+        val callSsid = formatCallSsid(callsign, ssid)
+        return "user $callSsid pass $passcode vers $version"
+    }
+
+    /** 呼号-SSID 拼接(BG7NTA + 5 → BG7NTA-5) */
+    fun formatCallSsid(callsign: String, ssid: String): String {
+        if (ssid.isNullOrEmpty()) return callsign
+        return "$callsign-$ssid"
+    }
+
+    /** 可选距离过滤: filter r/lat/lon/dist */
+    fun formatRangeFilter(latitude: Double, longitude: Double, distKm: Int): String {
+        return String.format("r/%.3f/%.3f/%d", latitude, longitude, distKm)
+    }
+
+    /** 高度扩展 /A=00000(英尺) */
+    fun formatAltitude(altitudeMeters: Double?): String {
+        if (altitudeMeters == null) return ""
+        return String.format("/A=%06d", (altitudeMeters * 3.2808399).toInt())
+    }
+
+    /** 航速航向扩展(节/度) */
+    fun formatCourseSpeed(speedMps: Double?, bearing: Float?): String {
+        if (speedMps == null || bearing == null) return ""
+        val knots = (speedMps * 1.94384449).toInt()
+        return String.format("/%03d/%03d", bearing.toInt(), knots)
+    }
+}
+
+/**
+ * APRS 位置编码(ab0oo Position.java 逆向移植)。
+ * 非压缩:DDMM.MMN/DDDMM.MME;压缩:base91。
+ */
+class AprsPosition(
+    val latitude: Double,
+    val longitude: Double,
+    val symbolTable: Char,
+    val symbolCode: Char,
+    val positionAmbiguity: Int = 0
+) {
+
+    /** 非压缩格式(APRS-IS 默认上报格式) */
+    fun toUncompressedString(): String {
+        val lat = getDMS(latitude, true)
+        val lon = getDMS(longitude, false)
+        return "$lat$symbolTable$lon$symbolCode"
+    }
+
+    /** 压缩格式(base91,标准 APRS 算法) */
+    fun toCompressedString(): String {
+        val jRound = round((90.0 - latitude) * 380926.0).toLong()
+        val j = jRound / 753571 + 33
+        val j2 = jRound % 753571
+        val j3 = j2 / 8281 + 33
+        val j4 = j2 % 8281
+        val i = (j4 % 91).toInt() + 33
+        val jRound2 = round((longitude + 180.0) * 190463.0).toLong()
+        val j5 = jRound2 / 753571 + 33
+        val j6 = jRound2 % 753571
+        val j7 = 33 + j6 / 8281
+        val j8 = j6 % 8281
+        return "" + symbolTable + j.toInt().toChar() + j3.toInt().toChar() +
+            ((j4 / 91).toInt() + 33).toChar() + i.toChar() +
+            j5.toInt().toChar() + j7.toInt().toChar() +
+            ((j8 / 91).toInt() + 33).toChar() +
+            ((j8 % 91).toInt() + 33).toChar() + symbolCode
+    }
+
+    /** 单轴 DMS 编码(百分位) */
+    private fun getDMS(value: Double, isLat: Boolean): String {
+        var iRound = round(value * 6000.0).toInt()
+        if (iRound < 0) iRound = -iRound
+        val degrees = iRound / 6000
+        val minutes = (iRound / 100) % 60
+        val hundredths = iRound % 100
+        val frac = when (positionAmbiguity) {
+            1 -> "  .  "
+            2 -> String.format("%d .  ", minutes / 10)
+            3 -> String.format("%02d.  ", minutes)
+            4 -> String.format("%02d.%d ", minutes, hundredths / 10)
+            else -> String.format("%02d.%02d", minutes, hundredths)
+        }
+        return if (isLat) {
+            val ns = if (value >= 0) 'N' else 'S'
+            String.format("%02d%s%c", degrees, frac, ns)
+        } else {
+            val ew = if (value >= 0) 'E' else 'W'
+            String.format("%03d%s%c", degrees, frac, ew)
+        }
+    }
+}