存量积累：生图素人感约束+评图分+幂等防重跑+审核回路

- 015-017迁移：image_candidate 文案复审/AI视觉分/重生标记
- constants C7素人感约束(反电商摆拍对齐真实笔记)+C3叠字口子
- celery visibility_timeout=2h 防长任务被误判重投重复烧钱(task75教训)
- image_scorer 评图分(只筛选+展示,真实信号才进飞轮权重)
- storyboard/image_gen/pipeline_io 生图存量
- task_actions/tasks/task_service/flywheel 审核回路+飞轮存量

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

backend/app/services/ai_engine/preference_aggregator.py

@@ -48,13 +48,14 @@ def aggregate_preference_context(
 
     for e in relevant:
         sig_type = e.get("signal_type", "")
-        angle    = str(e.get("angle_label", "")).strip()
+        angle    = str(e.get("angle_label") or "").strip()
         weight   = int(e.get("signal_weight", 1))
 
-        if sig_type in ("text_select", "approve") and angle:
+        # text_edit(改稿)是最强真实信号,角度按权重计入(倩倩姐2026-06-16拍板)
+        if sig_type in ("text_select", "approve", "text_edit") and angle:
             angle_counts[angle] += weight
         elif sig_type == "reject_with_reason":
-            reason = str(e.get("reason", "")).strip()
+            reason = str(e.get("reason") or "").strip()
             if reason:
                 reject_reasons.append(reason)