fix: correct subprocess script path and add TaskLog for trends trigger

platform/backend/app/api/system.py

@@ -235,12 +235,12 @@ def trigger_metrics_sync():
 def trigger_refresh_search_cache(db: Session = Depends(get_db), current_user=Depends(get_current_user)):
     try:
         import sys as sys_mod
-        scripts_dir = Path(__file__).parent.parent.parent.parent / "scripts"
+        scripts_dir = PROJECT_ROOT / "scripts"
         from ..database import SessionLocal as _ss
         proc = subprocess.Popen(
             [sys_mod.executable, str(scripts_dir / "opencode_search.py"), "--refresh-cache"],
             stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True,
-            cwd=scripts_dir.parent.parent
+            cwd=str(PROJECT_ROOT)
         )
         logger.info("Search cache refresh started (pid=%s)", proc.pid)
         log = TaskLog(module_id="scheduled_refresh_search_cache", task_name="🔍 搜索缓存", status="running", message="搜索缓存刷新已启动", triggered_by="manual", started_at=datetime.now(timezone.utc), result_data={"pid": proc.pid})
@@ -254,17 +254,24 @@ def trigger_refresh_search_cache(db: Session = Depends(get_db), current_user=Dep
         raise HTTPException(status_code=500, detail=str(e))
 
 @router.post("/trends/run")
-def trigger_trends_refresh():
+def trigger_trends_refresh(db: Session = Depends(get_db), current_user=Depends(get_current_user)):
     try:
         import sys as sys_mod
-        scripts_dir = Path(__file__).parent.parent.parent.parent / "scripts"
+        scripts_dir = PROJECT_ROOT / "scripts"
+        from ..database import SessionLocal as _ss
         proc = subprocess.Popen(
             [sys_mod.executable, str(scripts_dir / "trends.py")],
             stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True,
-            cwd=scripts_dir.parent.parent
+            cwd=str(PROJECT_ROOT)
         )
         logger.info("Trends refresh started (pid=%s)", proc.pid)
-        return {"message": "热点趋势刷新已后台启动", "pid": proc.pid}
+        log = TaskLog(module_id="scheduled_fetch_trends", task_name="🔥 热点趋势", status="running", message="热点趋势刷新已启动", triggered_by="manual", started_at=datetime.now(timezone.utc), result_data={"pid": proc.pid})
+        db.add(log)
+        db.commit()
+        log_id = log.id
+        t = threading.Thread(target=_monitor_subprocess, args=(log_id, proc, "scheduled_fetch_trends", "🔥 热点趋势", _ss), daemon=True)
+        t.start()
+        return {"message": "热点趋势刷新已后台启动", "pid": proc.pid, "log_id": log_id}
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))