feat(serial): 优化CH934x串口写入性能并修复多认证并发冲突

- 引入独立写执行器池确保同端口有序不同端口可并发
- 将同步写操作改为异步执行避免UI线程阻塞
- 实现认证UI协调器防止身份验证与告警覆盖层冲突
- 添加嵌套单用户认证状态快照管理机制
- 修复双人验证中用户身份一致性检查逻辑
- 优化抽屉信息轮询批量请求提升响应效率
- 修复管理账户权限组关联关系初始化问题
- 调整轮询间隔参数提高系统响应性

android/src/main/java/com/xiarui/ch934x_serial/Ch934xSerialPlugin.java

@@ -21,6 +21,8 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
 import cn.wch.ch934xlib.CH934XManager;
@@ -84,6 +86,22 @@ public class Ch934xSerialPlugin implements FlutterPlugin, MethodCallHandler, Act
     /** Modem 状态位缓存(CTS/DSR/RI/DCD)。SDK 仅以回调方式推送,这里聚合最近一次。 */
     private int modemStatusCache = 0;
 
+    /** 每个串口独立的单线程写执行器：同端口有序，不同端口可并发。 */
+    private final ExecutorService[] writeExecutors = createWriteExecutors();
+
+    private static ExecutorService[] createWriteExecutors() {
+        ExecutorService[] executors = new ExecutorService[8];
+        for (int i = 0; i < executors.length; i++) {
+            final int port = i;
+            executors[i] = Executors.newSingleThreadExecutor(runnable -> {
+                Thread thread = new Thread(runnable, "ch934x-write-" + port);
+                thread.setDaemon(true);
+                return thread;
+            });
+        }
+        return executors;
+    }
+
     @Override
     public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
         applicationContext = binding.getApplicationContext();
@@ -153,6 +171,9 @@ public class Ch934xSerialPlugin implements FlutterPlugin, MethodCallHandler, Act
         activeSerialNumber = -1;
         modemCallbackRegistered = false;
         exceptionCallbackEnabled = false;
+        for (ExecutorService executor : writeExecutors) {
+            executor.shutdownNow();
+        }
     }
 
     @Override
@@ -211,7 +232,7 @@ public class Ch934xSerialPlugin implements FlutterPlugin, MethodCallHandler, Act
                     result.success(handleRead(call));
                     break;
                 case "write":
-                    result.success(handleWrite(call));
+                    handleWriteAsync(call, result);
                     break;
                 case "setGpioOutput":
                     result.success(handleSetGpioOutput(call));
@@ -575,26 +596,35 @@ public class Ch934xSerialPlugin implements FlutterPlugin, MethodCallHandler, Act
         }
     }
 
-    /** 文档 6.2.1。 */
+    /** 文档 6.2.1。阻塞 SDK 写入在对应串口的专用线程执行。 */
-    private int handleWrite(@NonNull MethodCall call) throws UartLibException {
+    private void handleWriteAsync(@NonNull MethodCall call, @NonNull Result result) {
         if (activeDevice == null) {
-            return 0;
+            result.success(0);
+            return;
         }
         byte[] data = call.argument("data");
         if (data == null || data.length == 0) {
-            return 0;
+            result.success(0);
+            return;
         }
         Integer portIndex = call.argument("serialPortIndex");
         int idx = portIndex != null ? portIndex : activeSerialNumber;
-        if (idx < 0) {
+        if (idx < 0 || idx >= writeExecutors.length) {
-            return 0;
+            result.success(0);
+            return;
         }
+        final UsbDevice device = activeDevice;
+        writeExecutors[idx].execute(() -> {
+            int written = 0;
             try {
-            return CH934XManager.getInstance().writeData(
+                written = CH934XManager.getInstance().writeData(
-                    activeDevice, idx, data, data.length, 2000);
+                        device, idx, data, data.length, 2000);
-        } catch (ChipException e) {
+            } catch (Throwable ignored) {
-            return 0;
+                // 与原同步实现一致：写失败返回 0，由 Dart 层处理。
             }
+            final int completed = written;
+            new Handler(Looper.getMainLooper()).post(() -> result.success(completed));
+        });
     }
 
     // ------------------------------------------------------------------------