fix: 修复每次打印后关闭设备导致二次打印报设备未打开

移除 PrintHelper/PrintJob/PrinterManager/PrinterTestScreen 中每次打印后的 closeDevice() 调用，
设备生命周期由 MainActivity 管理（onStart 打开，onDestroy 关闭），避免反复 close->open 导致 SDK open() 失败。

app/src/main/java/com/example/ops_android/printer/PrintHelper.kt

@@ -4,7 +4,6 @@ import com.example.ops_android.data.model.Item
 import com.example.ops_android.data.model.PurchaseOrder
 import com.example.ops_android.data.model.WorkOrder
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
@@ -36,14 +35,7 @@ object PrintHelper {
                 } else {
                     printerManager.addLineFeed((unwindMm / 7).toInt().coerceAtLeast(2))
                 }
-                printerManager.commit().fold(
+                printerManager.commit()
-                    onSuccess = {
-                        delay(1000)
-                        printerManager.closeDevice()
-                        Result.success(Unit)
-                    },
-                    onFailure = { Result.failure(it) }
-                )
             } catch (e: Exception) {
                 Result.failure(e)
             }
@@ -73,14 +65,7 @@ object PrintHelper {
                 } else {
                     printerManager.addLineFeed((unwindMm / 7).toInt().coerceAtLeast(2))
                 }
-                printerManager.commit().fold(
+                printerManager.commit()
-                    onSuccess = {
-                        delay(1000)
-                        printerManager.closeDevice()
-                        Result.success(Unit)
-                    },
-                    onFailure = { Result.failure(it) }
-                )
             } catch (e: Exception) {
                 Result.failure(e)
             }
@@ -111,14 +96,7 @@ object PrintHelper {
                 } else {
                     printerManager.addLineFeed((unwindMm / 7).toInt().coerceAtLeast(2))
                 }
-                printerManager.commit().fold(
+                printerManager.commit()
-                    onSuccess = {
-                        delay(1000)
-                        printerManager.closeDevice()
-                        Result.success(Unit)
-                    },
-                    onFailure = { Result.failure(it) }
-                )
             } catch (e: Exception) {
                 Result.failure(e)
             }
@@ -149,14 +127,7 @@ object PrintHelper {
                 } else {
                     printerManager.addLineFeed((unwindMm / 7).toInt().coerceAtLeast(2))
                 }
-                printerManager.commit().fold(
+                printerManager.commit()
-                    onSuccess = {
-                        delay(1000)
-                        printerManager.closeDevice()
-                        Result.success(Unit)
-                    },
-                    onFailure = { Result.failure(it) }
-                )
             } catch (e: Exception) {
                 Result.failure(e)
             }

app/src/main/java/com/example/ops_android/printer/PrintJob.kt

@@ -46,8 +46,6 @@ class PrintJob(private val manager: PrinterManager) {
         if (lineFeeds > 0) manager.addLineFeed(lineFeeds).getOrThrow()
 
         manager.commit().getOrThrow()
-        Thread.sleep(1500)
-        manager.closeDevice().getOrThrow()
     }
 
     /** 初始化 → 添加内容 → 提交（不关闭） */

app/src/main/java/com/example/ops_android/printer/PrinterManager.kt

@@ -301,8 +301,6 @@ class PrinterManager(private val context: Context) {
         initDevice().getOrThrow()
         addText(text).getOrThrow()
         commit().getOrThrow()
-        Thread.sleep(1500)
-        closeDevice().getOrThrow()
     }
 
     fun quickLabel(text: String): Result<Unit> = runCatching {
@@ -310,8 +308,6 @@ class PrinterManager(private val context: Context) {
         enableMarkDetection(true).getOrThrow()
         addText(text).getOrThrow()
         commit().getOrThrow()
-        Thread.sleep(1500)
-        closeDevice().getOrThrow()
     }
 
     /** 创建链式打印任务 */

app/src/main/java/com/example/ops_android/ui/settings/PrinterTestScreen.kt

@@ -14,7 +14,6 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.example.ops_android.ui.LocalAppContainer
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
@@ -120,8 +119,6 @@ fun PrinterTestScreen(onBack: () -> Unit) {
                         val pm = printerManager!!
                         pm.initDevice().getOrThrow()
                         pm.commit().getOrThrow()
-                        delay(1000)
-                        pm.closeDevice().getOrThrow()
                     }
                 },
                 modifier = Modifier.fillMaxWidth(),
@@ -137,8 +134,6 @@ fun PrinterTestScreen(onBack: () -> Unit) {
                         pm.initDevice().getOrThrow()
                         pm.addLineFeed(5)
                         pm.commit().getOrThrow()
-                        delay(1000)
-                        pm.closeDevice().getOrThrow()
                     }
                 },
                 modifier = Modifier.fillMaxWidth(),
@@ -155,8 +150,6 @@ fun PrinterTestScreen(onBack: () -> Unit) {
                         pm.initDevice().getOrThrow()
                         pm.addLineFeed(10)
                         pm.commit().getOrThrow()
-                        delay(1000)
-                        pm.closeDevice().getOrThrow()
                     }
                 },
                 modifier = Modifier.fillMaxWidth(),