fix: close WebSocket after commit timeout in both realtime sessions

WebSocket adversarial scenario audit found: when commit() times out
(30s), the Promise was resolved but the WebSocket left open. This
wastes server resources and could cause stale events from being
processed by a future session.

Fixed in both OpenAIRealtimeSession and ParaformerRealtimeSession:
timeout callbacks now call this.close() after resolving.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: liangweifeng

electron/stt-service.ts

@@ -230,7 +230,7 @@ class OpenAIRealtimeSession implements IRealtimeSession {
         this.finishedResolve = resolve;
         if (this.config.finishEvent) this.ws!.send(JSON.stringify(this.config.finishEvent));
         this.commitTimeout = setTimeout(() => {
-          if (this.finishedResolve) { this.finishedResolve = null; resolve(this.getFinalText()); }
+          if (this.finishedResolve) { this.finishedResolve = null; resolve(this.getFinalText()); this.close(); }
         }, 30000);
       });
     }
@@ -239,7 +239,7 @@ class OpenAIRealtimeSession implements IRealtimeSession {
       this.completeResolve = resolve;
       if (this.config.commitEvent) this.ws!.send(JSON.stringify(this.config.commitEvent));
       this.commitTimeout = setTimeout(() => {
-        if (this.completeResolve) { this.completeResolve = null; resolve(this.getFinalText()); }
+        if (this.completeResolve) { this.completeResolve = null; resolve(this.getFinalText()); this.close(); }
       }, 30000);
     });
   }
@@ -434,6 +434,7 @@ class ParaformerRealtimeSession implements IRealtimeSession {
           console.warn('[Paraformer] finish timeout');
           this.finishedResolve = null;
           resolve(this.getFinalText());
+          this.close();
         }
       }, 30000);
     });