refactor(config): 统一使用应用服务器时间

- 删除 dao.Now()，不再额外执行 SELECT NOW(3)
- 配置写入、历史记录和增量游标全部使用 time.Now()
- 移除数据库时间获取失败的错误分支

server/internal/handler/app.go

@@ -4,7 +4,6 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"kenaito-conf/server/internal/dao"
-	"kenaito-conf/server/internal/logger"
 	"kenaito-conf/server/internal/middleware"
 	"kenaito-conf/server/internal/model"
 	"net/http"
@@ -259,12 +258,7 @@ func (h *AppHandler) Delete(c *gin.Context) {
 		return
 	}
 
-	now, err := dao.Now()
-	if err != nil {
-		logger.SugaredLogger.Errorf("[AppHandler.Delete] get database time error: %v", err)
-		c.JSON(http.StatusInternalServerError, model.WrapperResponse{Code: 500, Msg: "删除失败"})
-		return
-	}
+	now := time.Now()
 
 	app.Enabled = false
 	app.UpdatedBy = userInfo.Name