fix(ai-outfit): 货号(B列)改为可选，空货号不再跳过整行 (§19.14)

用户表的「商品id(货号)」整列为空时，行有效性判定（标题+货号+图三者非空）
把每一行都判为不完整 → read_all_rows 与 load_outfit_tasks 都返回 0：预览下拉
只剩占位符，且「开始生成」也判定无待处理行。货号不进提示词、目录行输出名沿用
源图名，对该用法是多余约束。

- excel_service.py: read_all_rows / load_outfit_tasks 完整性判定改为只要求
  标题 + 衣服图路径 非空，货号可空（状态过滤不变）
- core/ai_outfit.py: 单文件行货号为空时输出名回退 Path(garment).stem
  （货号非空仍用 货号.jpg）；目录行不变
- ai_outfit_panel.py: 样本下拉标签货号为空显示「(无货号)」
- tests: 空货号行被 read_all_rows/load_outfit_tasks 收录、单文件空货号按源图名命名
- docs/11 §4(表+规则)/§9(命名回退)、tasks.md §19.14

离屏冒烟：标题填/货号空/C=目录 → 预览下拉有行、生成产出到子目录、E=完成；
全套测试在 Python 3.7 全绿（test_config_service 的失败属并行的出厂模板工作，与本次无关）。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/widgets/ai_outfit_panel.py

@@ -687,8 +687,9 @@ class AiOutfitPanel(QWidget):
         self._sample_combo.clear()
         if tasks:
             for t in tasks:
+                pid = t.product_id if (t.product_id and t.product_id.strip()) else "(无货号)"
                 self._sample_combo.addItem(
-                    "第 {} 行 · {} · {}".format(t.row_index, t.product_id, t.title), t)
+                    "第 {} 行 · {} · {}".format(t.row_index, pid, t.title), t)
         else:
             self._sample_combo.addItem("（选 Excel 后显示替换效果）", None)
         self._sample_combo.blockSignals(False)

src/core/ai_outfit.py

@@ -167,7 +167,10 @@ def generate_outfit_image(
         prompt = render_prompt(prompt_template, task, resolution=resolution)
         client = api_client or ImageApiClient(model_config)
         image_bytes = client.generate(prompt, task.garment_path, resolution=resolution)
-        output_path = make_outfit_output_path(output_dir, task.product_id)
+        # 货号可空：为空时输出名回退用源图名（docs/11 §9）。
+        name = task.product_id if (task.product_id and str(task.product_id).strip()) \
+            else Path(task.garment_path).stem
+        output_path = make_outfit_output_path(output_dir, name)
         save_jpg_under_limit(image_bytes, output_path, quality=quality)
         logger.info("Generated outfit row %s -> %s", task.row_index, output_path)
         return OutfitResult(

src/services/excel_service.py

@@ -72,8 +72,9 @@ def load_outfit_tasks(excel_path, retry_failed=False):
     A title, B product id, C garment path, D output path, E status, F error.
 
     Rows start at 2. Completed rows are always skipped. Failed rows are included
-    only when *retry_failed* is True. Rows missing title/product/path are skipped
-    silently and are not written back.
+    only when *retry_failed* is True. Row validity needs only 标题 + 衣服图路径;
+    货号 (B) is optional (docs/11 §4). Rows missing title/path are skipped silently
+    and are not written back.
     """
     path = Path(excel_path)
     workbook = load_workbook(str(path))
@@ -86,7 +87,8 @@ def load_outfit_tasks(excel_path, retry_failed=False):
             product_id = sheet.cell(row_index, COL_PRODUCT_ID).value
             garment_path = sheet.cell(row_index, COL_GARMENT_PATH).value
 
-            if _is_empty(title) or _is_empty(product_id) or _is_empty(garment_path):
+            # 货号(B)可空：只要求 标题 + 衣服图路径 非空（docs/11 §4）。
+            if _is_empty(title) or _is_empty(garment_path):
                 logger.debug("Skipped incomplete outfit row %s in %s", row_index, path)
                 continue
 
@@ -117,9 +119,9 @@ def read_all_rows(excel_path):
     """Return an OutfitTask for every valid data row, ignoring E-column status.
 
     Unlike load_outfit_tasks (which filters for *processable* rows), this returns
-    all rows whose title/product/garment are filled — including 「完成」/「失败」 —
-    for preview/sample purposes only (docs/11 §10.3). Rows missing any of those
-    fields are skipped.
+    all rows whose 标题 + 衣服图路径 are filled — including 「完成」/「失败」, and
+    regardless of 货号 (which is optional, docs/11 §4) — for preview/sample purposes
+    only (docs/11 §10.3). Rows missing title/garment are skipped.
     """
     path = Path(excel_path)
     workbook = load_workbook(str(path))
@@ -130,7 +132,7 @@ def read_all_rows(excel_path):
             title = sheet.cell(row_index, COL_TITLE).value
             product_id = sheet.cell(row_index, COL_PRODUCT_ID).value
             garment_path = sheet.cell(row_index, COL_GARMENT_PATH).value
-            if _is_empty(title) or _is_empty(product_id) or _is_empty(garment_path):
+            if _is_empty(title) or _is_empty(garment_path):   # 货号可空
                 continue
             raw_status = sheet.cell(row_index, COL_STATUS).value
             rows.append(