feat: 添加语音模块支持，优化服务启动方式

electron/services/opencodeService.ts

@@ -150,7 +150,8 @@ class OpenCodeService {
     try {
       log.info('[OpenCodeService] Stopping...');
 
-      const pid = this.process.pid;
+      const pid = this.process?.pid;
+      const processRef = this.process;
       this.process = null;
       this._isRunning = false;
 
@@ -165,11 +166,11 @@ class OpenCodeService {
             resolve({ success: true });
           });
         });
-      } else if (pid) {
-        this.process?.kill('SIGTERM');
+      } else if (pid && processRef) {
+        processRef.kill('SIGTERM');
         await new Promise<void>((resolve) => setTimeout(resolve, 1000));
-        if (this.process && !this.process.killed) {
-          this.process.kill('SIGKILL');
+        if (!processRef.killed) {
+          processRef.kill('SIGKILL');
         }
         this.restartAttempts = 0;
         log.info('[OpenCodeService] Stopped');