fix: harden online validation flows

backend/app/services/ai_engine/fission_prompt.py

@@ -165,6 +165,20 @@ def build_fission_prompt(
         kw_parts = [x for x in ([name] + sp_words + ([audience] if audience != "未提供" else [])) if x and x != "未提供"]
         kw_line = "、".join(kw_parts) if kw_parts else ""
 
+    benchmark_refs = prod.get("benchmark_refs") or []
+    benchmark_lines: list[str] = []
+    for idx, ref in enumerate(benchmark_refs[:3], start=1):
+        if not isinstance(ref, dict):
+            continue
+        compact = []
+        for key in ("title_style", "cover_hook", "pain_point", "scene", "selling_angle", "visual_structure"):
+            val = ref.get(key)
+            if val:
+                compact.append(f"{key}:{val}")
+        if compact:
+            benchmark_lines.append(f"标杆配方{idx}：" + "；".join(compact))
+    benchmark_block = "\n".join(benchmark_lines) if benchmark_lines else "未选择或未分析完成"
+
     # D3修复：按套序循环分配 A/B/C 叙事主线
     narrative_keys = list(TEXT_NARRATIVE_BY_STRATEGY.keys())  # ["A","B","C"]
     narrative_lines = []
@@ -182,6 +196,7 @@ def build_fission_prompt(
 产品卖点：{'、'.join(points) or '未提供'}
 目标人群：{audience}
 关键词：{kw_line}
+标杆8维配方参考：{benchmark_block}
 裂变维度：{'、'.join(dims)}
 爆款参考度：{strategy['level_label']}。{strategy['prompt_rule']}
 生成数量：{note_count}套