feat(product-suite): add global generation history

app/gui/workers.py

@@ -418,6 +418,34 @@ class ProductSuiteGenerateWorker(BaseWorker):
         return summary
 
 
+class ProductSuiteHistoryExportWorker(BaseWorker):
+    """Copy one product-suite generation round outside the GUI thread."""
+
+    def __init__(self, project_id, generation_round_key, parent_dir, *, db_path=None):
+        super().__init__()
+        self.project_id = int(project_id)
+        self.generation_round_key = generation_round_key
+        self.parent_dir = str(parent_dir or "")
+        self.db_path = db_path
+
+    def execute(self):
+        self.log.emit("[商品套图] 导出历史套图：开始")
+        result = image_studio_export.export_generation_round(
+            self.project_id,
+            self.generation_round_key,
+            self.parent_dir,
+            path=self.db_path,
+            should_stop=self.should_cancel,
+        )
+        self.log.emit("[商品套图] 导出历史套图：完成")
+        return {
+            "target_dir": result.target_dir,
+            "file_count": len(result.files),
+            "skipped_count": int(result.skipped_count),
+            "cancelled": bool(result.cancelled),
+        }
+
+
 class ProductSuiteAiWriteWorker(BaseWorker):
     """Analyze local product images without blocking the suite workspace."""