v0.9.0: connection testing feature

- ConnectionTester: TCP port connectivity test with latency
- Test button (📡) on each saved connection item
- Visual result: reachable (green) or error (red)
- Async test via coroutine (no UI freeze)

app/src/main/java/ai/openclaw/app/ui/tergent/ConnectionTester.kt

@@ -0,0 +1,58 @@
+package ai.openclaw.app.ui.tergent
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.net.InetSocketAddress
+import java.net.Socket
+
+/**
+ * 连接测试工具：测试目标主机端口是否可达
+ */
+object ConnectionTester {
+
+    data class TestResult(
+        val host: String,
+        val port: Int,
+        val reachable: Boolean,
+        val latencyMs: Long? = null,
+        val error: String? = null
+    )
+
+    /**
+     * 测试 TCP 端口连通性
+     * @param host 主机地址
+     * @param port 端口
+     * @param timeoutMs 超时毫秒（默认 5000）
+     */
+    suspend fun testConnection(host: String, port: Int, timeoutMs: Int = 5000): TestResult =
+        withContext(Dispatchers.IO) {
+            val start = System.currentTimeMillis()
+            try {
+                val socket = Socket()
+                socket.connect(InetSocketAddress(host, port), timeoutMs)
+                socket.close()
+                val latency = System.currentTimeMillis() - start
+                TestResult(host, port, reachable = true, latencyMs = latency)
+            } catch (e: Exception) {
+                TestResult(
+                    host, port, reachable = false,
+                    error = when {
+                        e.message?.contains("Timeout", ignoreCase = true) == true -> "连接超时"
+                        e.message?.contains("refused", ignoreCase = true) == true -> "连接被拒绝"
+                        e.message?.contains("resolve", ignoreCase = true) == true -> "无法解析主机名"
+                        else -> e.message ?: "未知错误"
+                    }
+                )
+            }
+        }
+
+    /**
+     * 格式化测试结果显示
+     */
+    fun formatResult(result: TestResult): String {
+        return when {
+            result.reachable -> "✅ ${result.host}:${result.port} (${result.latencyMs}ms)"
+            else -> "❌ ${result.host}:${result.port} — ${result.error}"
+        }
+    }
+}

app/src/main/java/ai/openclaw/app/ui/tergent/SshHost.kt

@@ -3,6 +3,7 @@ package ai.openclaw.app.ui.tergent
 import android.net.Uri
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import kotlinx.coroutines.launch
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.horizontalScroll
@@ -303,6 +304,9 @@ private fun ColumnScope.ConnectionListView(
 @Composable
 private fun SavedConnectionItem(config: SshConfig, onConnect: () -> Unit, onDelete: () -> Unit) {
     var showDeleteConfirm by remember { mutableStateOf(false) }
+    var testResult by remember { mutableStateOf<ConnectionTester.TestResult?>(null) }
+    var testing by remember { mutableStateOf(false) }
+    val testScope = rememberCoroutineScope()
     Surface(
         modifier = Modifier.fillMaxWidth().padding(vertical = 3.dp).clickable { onConnect() },
         shape = RoundedCornerShape(8.dp),
@@ -314,6 +318,31 @@ private fun SavedConnectionItem(config: SshConfig, onConnect: () -> Unit, onDele
             Column(modifier = Modifier.weight(1f)) {
                 Text(config.displayName.ifEmpty { config.host }, color = textPrimary, fontSize = 14.sp, fontWeight = FontWeight.Medium, maxLines = 1, overflow = TextOverflow.Ellipsis)
                 Text("${config.username}@${config.host}:${config.port}", color = textSecondary, fontSize = 11.sp, fontFamily = FontFamily.Monospace)
+                if (testResult != null) {
+                    Text(
+                        text = ConnectionTester.formatResult(testResult!!),
+                        color = if (testResult!!.reachable) accent else danger,
+                        fontSize = 10.sp,
+                        fontFamily = FontFamily.Monospace
+                    )
+                } else if (testing) {
+                    Text("⏳ 测试中...", color = textTertiary, fontSize = 10.sp, fontFamily = FontFamily.Monospace)
+                }
+            }
+            // 测试按钮
+            IconButton(
+                onClick = {
+                    testing = true
+                    testResult = null
+                    testScope.launch {
+                        testResult = ConnectionTester.testConnection(config.host, config.port)
+                        testing = false
+                    }
+                },
+                modifier = Modifier.size(28.dp),
+                enabled = !testing
+            ) {
+                Text(if (testing) "⏳" else "📡", fontSize = 12.sp)
             }
             FilledTonalButton(
                 onClick = onConnect,