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/core/scheduler.py

@@ -10,6 +10,7 @@ from apscheduler.triggers.cron import CronTrigger
 from .generator import run_creator
 from .optimizer import run_optimizer
 from .sync import sync_all_topics
+from .collector import run_collector
 
 logger = logging.getLogger(__name__)
 
@@ -23,6 +24,14 @@ class TaskScheduler:
             logger.warning("Scheduler already started")
             return
         # 使用 CronTrigger 设置每日固定时间点
+        self.scheduler.add_job(
+            self._run_collect,
+            CronTrigger(hour=1, minute=30),
+            id='scheduled_collect',
+            replace_existing=True,
+            max_instances=1,
+            coalesce=True
+        )
         self.scheduler.add_job(
             self._run_sync,
             CronTrigger(hour=2, minute=30),
@@ -49,7 +58,7 @@ class TaskScheduler:
         )
         self.scheduler.start()
         self._started = True
-        logger.info("Scheduler started with daily cron triggers (02:30, 03:30, 04:30)")
+        logger.info("Scheduler started with daily cron triggers (01:30 collect, 02:30 sync, 03:30 generate, 04:30 optimize)")
     def shutdown(self):
         if self.scheduler.running:
             self.scheduler.shutdown()
@@ -79,6 +88,14 @@ class TaskScheduler:
         except Exception as e:
             logger.exception("[Scheduled] Optimization failed: %s", e)
 
+    def _run_collect(self):
+        try:
+            logger.info("[Scheduled] Starting topic collection...")
+            result = run_collector()
+            logger.info("[Scheduled] Collection completed: %s", result.get("output", "")[-200:])
+        except Exception as e:
+            logger.exception("[Scheduled] Collection failed: %s", e)
+
     def _run_sync(self):
         try:
             logger.info("[Scheduled] Starting data sync...")