Phase2: 真实热点数据接入

- trends.py新增百度/微博/知乎实时热搜API抓取，LLM为fallback
- 新增 source 字段标记数据来源
- scheduler.py新增 scheduled_fetch_trends 每日03:00定时刷新
- system.py新增 POST /api/system/trends/run 手动触发端点
- system.py modules/status 加入热点趋势模块
- index.html triggerModule 加入 trends 触发按钮

platform/backend/app/core/scheduler.py

@@ -3,8 +3,10 @@
 基于 APScheduler，支持在 FastAPI 生命周期内运行定时任务
 """
 import os
+import sys
 import logging
 from datetime import datetime
+from pathlib import Path
 from apscheduler.schedulers.background import BackgroundScheduler
 from apscheduler.triggers.cron import CronTrigger
 from .generator import run_creator
@@ -28,6 +30,14 @@ class TaskScheduler:
             CronTrigger(hour=1, minute=30),
             id='scheduled_collect',
         )
+        self.scheduler.add_job(
+            self._run_fetch_trends,
+            CronTrigger(hour=3, minute=0),
+            id='scheduled_fetch_trends',
+            replace_existing=True,
+            max_instances=1,
+            coalesce=True
+        )
         self.scheduler.add_job(
             self._run_generate,
             CronTrigger(hour=3, minute=30),
@@ -62,12 +72,31 @@ class TaskScheduler:
         )
         self.scheduler.start()
         self._started = True
-        logger.info("Scheduler started: 01:30 collect, 03:30 generate, 04:30 review, 05:00 optimize_sources, 06:00 metrics_sync")
+        logger.info("Scheduler started: 01:30 collect, 03:00 trends, 03:30 generate, 04:30 review, 05:00 optimize_sources, 06:00 metrics_sync")
     def shutdown(self):
         if self.scheduler.running:
             self.scheduler.shutdown()
             logger.info("Scheduler shut down")
 
+    def _run_fetch_trends(self):
+        """定时刷新热点趋势（百度/微博/知乎实时热搜 + LLM补充）"""
+        try:
+            logger.info("[Scheduled] Fetching hot trends...")
+            import subprocess
+            result = subprocess.run(
+                [sys.executable, str(Path(__file__).parent.parent.parent.parent / "scripts" / "trends.py")],
+                capture_output=True, text=True, timeout=120
+            )
+            if result.returncode == 0:
+                for line in result.stdout.strip().split("\n"):
+                    if line.strip():
+                        logger.info("[Trends] %s", line.strip())
+                logger.info("[Scheduled] Trends refreshed successfully")
+            else:
+                logger.warning("[Scheduled] Trends refresh failed: %s", result.stderr[-500:])
+        except Exception as e:
+            logger.exception("[Scheduled] Trends refresh error: %s", e)
+
     def _run_generate(self):
         try:
             logger.info("[Scheduled] Starting content generation...")