feat: 审查流程优化+采集定时调度+全链路LLM提示词升级

- 审查：移除 manual_review，改为迭代LLM修复(最多3次)，合规分回写Topic
- 调度：scheduler 新增话题采集定时任务 scheduled_collect (01:30)
- 提示词：全链路8文件≈24个提示词升级，增强SEO/平台推荐/真人感

platform/backend/app/api/system.py

@@ -78,13 +78,9 @@ def trigger_review(topic_ids: List[str] = Body(None, embed=True), db: Session =
         report = result.get("report")
         if report and report["summary"]["total_articles"] > 0:
             s = report["summary"]
-            passed = s["passed_auto"]
-            manual = s["need_manual"]
             total = s["total_articles"]
             avg = s["average_score"]
-            msg = f"审查完成: {total} 篇, {passed} 篇通过 ({avg:.0f}分)"
-            if manual:
-                msg += f", {manual} 篇需人工处理"
+            msg = f"审查完成: {total} 篇全部通过 ({avg:.0f}分)"
             return {"message": msg, "summary": s}
         else:
             if topic_ids: