fix(ai-outfit): 标题生成对「标题(A)空」的印花表不再误报无行 (§19.27)

catch-22：「生成标题」用 read_all_rows 取行，而它要求 标题(A)+原始图片路径(C)
都非空；但标题生成的目的就是填 A。印花导出表若 A 空（被清空/早期导出），
所有行被跳过 → 误报「该表没有可处理的行」。实测 output/20260623_094529.xlsx：
A 全空、C 是印花子目录。

- excel_service.read_all_rows 增 require_title=True 开关：False 时只在
  原始图片路径(C) 空时跳过、允许 标题(A) 空；默认 True 行为不变（预览/
  无待处理统计/图片生成 load_outfit_tasks 仍要求 A）
- ai_outfit_panel._TitleWorker.run 改调 read_all_rows(..., require_title=False)

测试：A 空+C 有的行 require_title=False 收录、默认跳过；C 空两种都跳过。
全套 py37 通过（test_config_service 的 packaging 模板失败属并行 §19.13，无关）。
离屏冒烟：真表 20260623_094529.xlsx 默认 0 行→require_title=False 加载 6 行；
worker 把 6 条标题按序回填 A、C(印花目录)不动。

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

src/app/widgets/ai_outfit_panel.py

@@ -175,7 +175,9 @@ class _TitleWorker(QObject):
 
         try:
             ensure_excel_writable(self._excel_path)
-            rows = read_all_rows(self._excel_path)
+            # 标题生成的行来源只要求 原始图片路径(C) 非空，标题(A) 可空——A 正是
+            # 要填的列；否则 A 空的印花表会被误判为无行（§19.27）。
+            rows = read_all_rows(self._excel_path, require_title=False)
         except Exception as exc:                        # noqa: BLE001 - report to UI
             self.failed.emit(str(exc))
             return

src/services/excel_service.py

@@ -115,13 +115,17 @@ def load_outfit_tasks(excel_path, retry_failed=False):
         workbook.close()
 
 
-def read_all_rows(excel_path):
+def read_all_rows(excel_path, require_title=True):
     """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 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.
+    all rows whose 衣服图路径 is filled — including 「完成」/「失败」, and regardless
+    of 货号 (optional, docs/11 §4) — for preview/sample purposes (docs/11 §10.3).
+
+    require_title (docs/11 §17.1 / §19.27): when True (default) a row also needs
+    标题(A) non-empty (preview / image-gen input). 标题生成 passes False because
+    its very job is to FILL A, so rows with an empty 标题 must NOT be skipped —
+    only 原始图片路径(C) is required.
     """
     path = Path(excel_path)
     workbook = load_workbook(str(path))
@@ -132,7 +136,7 @@ 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(garment_path):   # 货号可空
+            if _is_empty(garment_path) or (require_title and _is_empty(title)):
                 continue
             raw_status = sheet.cell(row_index, COL_STATUS).value
             rows.append(