feat: use image concurrency for outfit directories

src/app/widgets/ai_outfit_panel.py

@@ -112,6 +112,7 @@ class _OutfitWorker(QObject):
                 task, self._prompt, self._output_dir, self._model_config,
                 quality=self._quality, resolution=self._resolution,
                 request_interval=self._options.request_interval,
+                image_concurrency=self._options.concurrency,
                 image_log=self.log.emit,
             )
 
@@ -337,7 +338,7 @@ class AiOutfitPanel(QWidget):
         self._quality.addItems(_QUALITIES)
 
         pairs = [
-            ("并发数", self._concurrency), ("新请求间隔", self._interval),
+            ("图片并发数", self._concurrency), ("新请求间隔", self._interval),
             ("单任务冷却", self._cooldown), ("失败重试", self._retry_count),
             ("分辨率", self._resolution), ("JPG 质量", self._quality),
         ]