feat(engine): 优化字幕引擎、提升程序健壮性

- 优化服务器启动流程，增加异常处理
- 主程序和字幕引擎的 WebSocket 端口号改为随机生成

src/main/ControlWindow.ts

@@ -85,12 +85,13 @@ class ControlWindow {
 
     ipcMain.handle('control.engine.info', async () => {
       const info: EngineInfo = {
-        pid: 0, ppid: 0, cpu: 0, mem: 0, elapsed: 0
+        pid: 0, ppid: 0, port: 0, cpu: 0, mem: 0, elapsed: 0
       }
-      if(captionEngine.processStatus !== 'running') return info
+      if(captionEngine.status !== 'running') return info
       const stats = await pidusage(captionEngine.process.pid)
       info.pid = stats.pid
       info.ppid = stats.ppid
+      info.port = captionEngine.port
       info.cpu = stats.cpu
       info.mem = stats.memory
       info.elapsed = stats.elapsed