feat(通知): SafeW 只发正文并注入推送时间

去掉渠道标题前缀，模板可用 pushedAt 显示本地推送时间。

internal/notify/service.go

@@ -8,6 +8,7 @@ import (
 	"log/slog"
 	"strconv"
 	"strings"
+	"time"
 
 	"aiaa-notification-service/internal/condition"
 	"aiaa-notification-service/internal/engine"
@@ -85,6 +86,9 @@ func (s *Service) Process(ctx context.Context, req Request) (Result, error) {
 	if _, ok := req.Data["event"]; !ok && req.Event != "" {
 		req.Data["event"] = req.Event
 	}
+	if _, ok := req.Data["pushedAt"]; !ok {
+		req.Data["pushedAt"] = time.Now().In(time.Local).Format("2006.01.02 15:04:05")
+	}
 
 	content, err := s.renderer.Render(tmpl.Content, req.Data)
 	if err != nil {