fix(aprs): upload feedback, manual report reliability, station position

User testing round 3 (4.5.4): no success feedback on upload, aprs.fi
shows nothing, passcode calculator OK, notification present.

- Manual report now works even when service not running: ACTION_REPORT_NOW
  starts the service first (Toast "not configured" if missing callsign)
- Upload result feedback guaranteed: Toast always shows (short OK /
  long fail+reason), last result persisted (time/ok/detail) and shown
  in the settings card "Last report: HH:mm:ss OK/failed - detail"
- Position source: station position from settingsRepo (user decision)
  with live GPS last-known as fallback
- sendPacket reads the server confirmation line (short 3s timeout);
  server error text (Invalid/error) surfaces in Toast + card
- Strings EN/ZH/TR/IN/ID +4 keys
Verified: compileDebugKotlin all modules BUILD SUCCESSFUL,
check_strings 9 files OK.

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

@@ -59,13 +59,33 @@ class AprsIsClient(
         }
     }
 
-    /** 发送一个 APRS 包(一行) */
-    fun sendPacket(packetLine: String): Boolean {
+    /**
+     * 发送一个 APRS 包(一行)并尝试读服务器确认。
+     * 返回 null=发送失败;Pair(ok, detail)=发送结果(服务器错误原文在 detail)
+     */
+    fun sendPacket(packetLine: String): Pair<Boolean, String>? {
         synchronized(lock) {
-            val w = writer ?: return false
+            val w = writer ?: return null
             w.println(packetLine)
-            return !w.checkError()
+            if (w.checkError()) return Pair(false, "write failed")
         }
+        // 尝试读服务器响应(短超时 3s;APRS-IS 对格式错误会回错误行)
+        return runCatching {
+            val s = socket ?: return@runCatching Pair(true, "OK")
+            val oldTimeout = s.soTimeout
+            s.soTimeout = 3000
+            try {
+                val resp = reader?.readLine()
+                if (resp != null && (resp.contains("Invalid", ignoreCase = true) ||
+                        resp.contains("error", ignoreCase = true))) {
+                    Pair(false, resp.trim())
+                } else {
+                    Pair(true, if (resp.isNullOrBlank()) "OK" else resp.trim())
+                }
+            } finally {
+                s.soTimeout = oldTimeout
+            }
+        }.getOrElse { Pair(true, "OK") }
     }
 
     /** 读一行(服务器响应,超时抛异常) */

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

@@ -99,9 +99,10 @@ class AprsReporter(
 
             val pos = positionProvider()
             val packetLine = buildPositionPacket(cfg, pos?.first, pos?.second)
-            val ok = c.sendPacket(packetLine)
-            onReport(AprsReport(System.currentTimeMillis(), packetLine, ok,
-                if (ok) "OK" else "send failed"))
+            val result = c.sendPacket(packetLine)
+            val ok = result?.first == true
+            val detail = result?.second ?: "no connection"
+            onReport(AprsReport(System.currentTimeMillis(), packetLine, ok, detail))
             if (ok) onState(AprsState.Connected) else onState(AprsState.Error)
         } catch (e: Exception) {
             runCatching { client?.disconnect() }

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

@@ -24,6 +24,9 @@ object AprsStore {
     private const val KEY_STATUS = "status"
     private const val KEY_SYMBOL_TABLE = "symbol_table"
     private const val KEY_SYMBOL_CODE = "symbol_code"
+    private const val KEY_LAST_TIME = "last_report_time"
+    private const val KEY_LAST_OK = "last_report_ok"
+    private const val KEY_LAST_DETAIL = "last_report_detail"
 
     /** 读取配置(填入即保存,无需每次打开重填) */
     fun loadConfig(context: Context): AprsConfig {
@@ -42,6 +45,26 @@ object AprsStore {
         )
     }
 
+    /** 上次上报结果(供设置卡片显示) */
+    data class LastReport(val time: Long = 0L, val ok: Boolean = false, val detail: String = "")
+
+    fun loadLastReport(context: Context): LastReport {
+        val p = context.getSharedPreferences(PREFS, Context.MODE_PRIVATE)
+        return LastReport(
+            time = p.getLong(KEY_LAST_TIME, 0L),
+            ok = p.getBoolean(KEY_LAST_OK, false),
+            detail = p.getString(KEY_LAST_DETAIL, "") ?: ""
+        )
+    }
+
+    fun saveLastReport(context: Context, ok: Boolean, detail: String) {
+        context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit()
+            .putLong(KEY_LAST_TIME, System.currentTimeMillis())
+            .putBoolean(KEY_LAST_OK, ok)
+            .putString(KEY_LAST_DETAIL, detail)
+            .apply()
+    }
+
     /** 保存配置 */
     fun saveConfig(context: Context, cfg: AprsConfig) {
         context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit()