feat: 添加定时系统

- 实现定时任务

internal/schedule/schedule.go

@@ -0,0 +1,32 @@
+package schedule
+
+import (
+	"ckwk/internal/ckwk"
+	"ckwk/pkg/log"
+	"time"
+
+	"github.com/robfig/cron/v3"
+
+	"go.uber.org/zap"
+)
+
+func StartCron(m *ckwk.SessionManager) {
+	loc, _ := time.LoadLocation("Asia/Singapore")
+
+	c := cron.New(
+		cron.WithLocation(loc),
+	)
+
+	// 每天 6 点执行
+	_, err := c.AddFunc("0 2 * * *", func() {
+		log.Info("开始定时清理 Session")
+		m.ClearAll()
+	})
+
+	if err != nil {
+		log.Error("cron 添加任务失败", zap.Error(err))
+		return
+	}
+
+	c.Start()
+}