fix: batch_grow_v2.py 的 hr_options 从 HR_OPTIONS 动态生成，不再硬编码两档

旧代码硬编码 hr_options=[hr,nohr]，导致仅非高清批量跑完后 meta 仍含 hr 档，
报告脚本取 hr_opts[0]=hr 与实际结果的 nohr 不匹配，结果图全部渲染不出来。

scripts/batch_grow_v2.py

@@ -139,7 +139,7 @@ def main():
         "total": total, "ok": ok, "fail": fail,
         "elapsed_sec": round(elapsed, 1), "concurrency": CONCURRENCY,
         "hairstyles": [{"id": h, "cn": c} for h, c in HAIRSTYLES],
-        "hr_options": [{"is_hr": True, "tag": "hr"}, {"is_hr": False, "tag": "nohr"}],
+        "hr_options": [{"is_hr": is_hr, "tag": tag} for is_hr, tag in HR_OPTIONS],
         "faces": [os.path.splitext(f)[0] for f in faces],
         "generated_at": time.strftime("%Y-%m-%d %H:%M:%S"),
     }