fix(export): 生成的 AI 穿搭 Excel 字段名对齐标题生成产品图.xlsx

B 列从「货号」改为「商品id」，C 列从「衣服图路径」改为「原始图片路径」，
补第 7 列「货憨憨上传状态」留空，与用户实际模板文件完全一致。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_excel_service.py

@@ -156,8 +156,8 @@ class TestOutfitExcelService(unittest.TestCase):
         ws = wb.active
         try:
             self.assertEqual(
-                [ws.cell(1, c).value for c in range(1, 7)],
-                ["标题", "货号", "衣服图路径", "生成结果图片路径", "完成状态", "失败原因"],
+                [ws.cell(1, c).value for c in range(1, 8)],
+                ["标题", "商品id", "原始图片路径", "生成结果图片路径", "完成状态", "失败原因", "货憨憨上传状态"],
             )
             self.assertEqual(ws.max_row, 3)   # 1 header + 2 data
             self.assertEqual(ws.cell(2, 1).value, "floral")