fix: 修复语音文件缺失误报

批量语音读取失败时，并行回退到兼容的单条读取接口，避免批量接口异常导致全部语音被误判为缺失。

增量合并恢复可播放语音或转写后，清理矛盾的媒体及转写错误状态，并补充批量回退与增量合并回归测试。

tests/unit/voice-service.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it, vi } from 'vitest'
+import { VoiceService } from '../../src/main/voice-service'
+
+describe('VoiceService batch lookup', () => {
+  it('retries failed batch entries with the compatible single-item lookup', async () => {
+    const getVoiceDataBatch = vi.fn().mockResolvedValue([
+      { success: false, error: '获取语音数据失败' },
+      { success: false, error: '获取语音数据失败' }
+    ])
+    const service = new VoiceService({ getVoiceDataBatch } as never)
+    const resolveVoice = vi
+      .spyOn(service, 'resolveVoice')
+      .mockImplementation(async (_sessionId, localId) => ({
+        success: true,
+        data: `voice-${localId}`
+      }))
+
+    const result = await service.resolveVoices([
+      { sessionId: 'session', localId: 10, createTime: 100, svrId: '1000' },
+      { sessionId: 'session', localId: 11, createTime: 101, svrId: '1001' }
+    ])
+
+    expect(result).toEqual([
+      { success: true, data: 'voice-10' },
+      { success: true, data: 'voice-11' }
+    ])
+    expect(resolveVoice).toHaveBeenCalledTimes(2)
+    expect(resolveVoice).toHaveBeenNthCalledWith(1, 'session', 10, 100, '1000')
+    expect(resolveVoice).toHaveBeenNthCalledWith(2, 'session', 11, 101, '1001')
+  })
+})