fix(上传): 改进文件上传的稳定性和WAV文件头校验，解决本地录音后即刻转写不完整的问题，录音文件完全稳定后才上传cos

添加文件大小稳定检测机制，防止上传不完整文件
增加WAV文件头校验，确保文件完整性
优化文件移动操作，优先使用rename提高效率

lib/data/services/meeting/meeting_upload_service.dart

@@ -1,4 +1,5 @@
 import 'dart:io';
+import 'dart:async';
 import 'package:get/get.dart';
 import 'package:get_storage/get_storage.dart';
 
@@ -21,6 +22,9 @@ class MeetingUploadService extends GetxService {
 
   bool _isUpload = false;
   int _handled = 0; //队列处理指针,表示当前循环语句处理的任务数量
+  static const Duration _fileStableTimeout = Duration(seconds: 20);
+  static const Duration _fileStablePoll = Duration(milliseconds: 350);
+  static const int _fileStableNeededCount = 3;
 
   @override
   void onInit() {
@@ -80,8 +84,26 @@ class MeetingUploadService extends GetxService {
         meetingId.value = element['id'];
         try {
           int totalProgress = 0;
+          final filePath = (element['filepath'] ?? '').toString();
+          if (filePath.isEmpty) {
+            throw Exception('Empty upload file path');
+          }
+          final fileSizeBytes = await _waitForStableFileSize(
+            filePath,
+            timeout: _fileStableTimeout,
+            pollInterval: _fileStablePoll,
+            stableNeededCount: _fileStableNeededCount,
+          );
+          final isWav = filePath.toLowerCase().endsWith('.wav');
+          if (isWav) {
+            final ok = await _isWavHeaderConsistent(filePath, fileSizeBytes);
+            if (!ok) {
+              throw Exception('WAV header is inconsistent with file size');
+            }
+          }
+          element['fileSizeBytes'] = fileSizeBytes;
           final audiourl = await UploadOss.upload(
-            filepath: element['filepath'],
+            filepath: filePath,
             rootDir: element['rootdir'],
             onSendProgress: (int count, int total) {
               // uploadProgress.value = count / total;
@@ -139,6 +161,87 @@ class MeetingUploadService extends GetxService {
     _isUpload = false;
   }
 
+  Future<int> _waitForStableFileSize(
+    String filePath, {
+    Duration timeout = _fileStableTimeout,
+    Duration pollInterval = _fileStablePoll,
+    int stableNeededCount = _fileStableNeededCount,
+  }) async {
+    final file = File(filePath);
+    final deadline = DateTime.now().add(timeout);
+    int lastSize = -1;
+    int stableCount = 0;
+    while (DateTime.now().isBefore(deadline)) {
+      final exists = await file.exists();
+      if (exists) {
+        int size = 0;
+        try {
+          size = await file.length();
+        } catch (_) {
+          size = 0;
+        }
+        if (size > 0) {
+          if (size == lastSize) {
+            stableCount += 1;
+          } else {
+            stableCount = 0;
+            lastSize = size;
+          }
+          if (stableCount >= stableNeededCount) {
+            return size;
+          }
+        }
+      }
+      await Future.delayed(pollInterval);
+    }
+    throw TimeoutException('File not stable: $filePath', timeout);
+  }
+
+  Future<bool> _isWavHeaderConsistent(
+      String filePath, int fileSizeBytes) async {
+    RandomAccessFile? raf;
+    try {
+      raf = await File(filePath).open(mode: FileMode.read);
+      final header = await raf.read(12);
+      if (header.length < 12) return false;
+      final riff = String.fromCharCodes(header.sublist(0, 4));
+      final wave = String.fromCharCodes(header.sublist(8, 12));
+      if (riff != 'RIFF' || wave != 'WAVE') return true;
+
+      int offset = 12;
+      const int maxScanBytes = 64 * 1024;
+      while (offset + 8 <= fileSizeBytes && offset <= maxScanBytes) {
+        await raf.setPosition(offset);
+        final chunkHeader = await raf.read(8);
+        if (chunkHeader.length < 8) return false;
+        final chunkId = String.fromCharCodes(chunkHeader.sublist(0, 4));
+        final chunkSize = _readUint32Le(chunkHeader, 4);
+        final chunkDataStart = offset + 8;
+        final expectedEnd = chunkDataStart + chunkSize;
+        if (chunkId == 'data') {
+          return fileSizeBytes >= expectedEnd;
+        }
+        final paddedSize = chunkSize + (chunkSize % 2);
+        offset = chunkDataStart + paddedSize;
+      }
+      return true;
+    } catch (_) {
+      return true;
+    } finally {
+      try {
+        await raf?.close();
+      } catch (_) {}
+    }
+  }
+
+  int _readUint32Le(List<int> bytes, int offset) {
+    if (offset + 4 > bytes.length) return 0;
+    return (bytes[offset]) |
+        (bytes[offset + 1] << 8) |
+        (bytes[offset + 2] << 16) |
+        (bytes[offset + 3] << 24);
+  }
+
   void removeUpload(int id, {bool isDeleteTask = false}) {
     Map uploadData = uploadList.firstWhere(
       (element) => element['id'] == id,

lib/modules/meeting/controllers/meeting_home_controller.dart

@@ -260,8 +260,15 @@ class MeetingHomeController extends GetxController {
           final creationTime = fileStat.changed.millisecondsSinceEpoch;
 
           // 准备新路径
-          final fileName = filePath.split('/').last; //获取文件名（包含扩展名）
-          final newPath = "${destDir.path}/$fileName"; //构建新路径，保持原文件名
+          String fileName = filePath.split('/').last; //获取文件名（包含扩展名）
+          String newPath = "${destDir.path}/$fileName"; //构建新路径，保持原文件名
+          if (await File(newPath).exists()) {
+            final ext = path.extension(fileName);
+            final base = path.basenameWithoutExtension(fileName);
+            final ts = DateTime.now().millisecondsSinceEpoch;
+            fileName = '${base}_$ts$ext';
+            newPath = "${destDir.path}/$fileName";
+          }
 
           // 构建要存入数据库的音频文件抽象对象
           Map<String, Object?> data = {
@@ -286,6 +293,13 @@ class MeetingHomeController extends GetxController {
             ...data,
           });
           if (meetingResult != null) {
+            // 移动文件：优先 rename，失败再 copy+delete，确保上传读取的是完整目标文件
+            try {
+              await file.rename(newPath);
+            } catch (_) {
+              await file.copy(newPath);
+              await file.delete();
+            }
             // 安排后台上传任务
             meetingUploadService.addUpload(meetingId, newPath, 'LocalAudio');
 
@@ -306,10 +320,6 @@ class MeetingHomeController extends GetxController {
               });
             }
 
-            // 移动文件
-            await file.copy(newPath); // 复制到新路径
-            await file.delete(); // 删除原文件
-
             addUp++;
           }
         } catch (e) {