重构数据库备份与恢复模块 (#80)

* fix: 保存 LastResult 时截断字符串过长部分，以避免数据库报错

* refactor: 新增 entity.DbTaskBase 和 persistence.dbTaskBase, 用于实现数据库备份和恢复任务处理相关部分

* fix: aeskey变更后，解密密码出现数组越界访问错误

* fix: 时间属性为零值时，保存到 mysql 数据库报错

* refactor db.infrastructure.service.scheduler

* feat: 实现立即备份功能

* refactor db.infrastructure.service.db_instance

* refactor: 从数据库中获取数据库备份目录、mysql文件路径等配置信息

* fix: 数据库备份和恢复问题

* fix: 修改 .gitignore 文件，忽略数据库备份目录和数据库程序目录

server/internal/db/dbm/db_program_mysql_test.go

@@ -0,0 +1,25 @@
+package dbm
+
+import (
+	"github.com/stretchr/testify/require"
+	"mayfly-go/internal/db/domain/entity"
+	"strings"
+	"testing"
+)
+
+func Test_readBinlogInfoFromBackup(t *testing.T) {
+	text := `
+--
+-- Position to start replication or point-in-time recovery from
+--
+
+-- CHANGE MASTER TO MASTER_LOG_FILE='binlog.000003', MASTER_LOG_POS=379;
+`
+	got, err := readBinlogInfoFromBackup(strings.NewReader(text))
+	require.NoError(t, err)
+	require.Equal(t, &entity.BinlogInfo{
+		FileName: "binlog.000003",
+		Sequence: 3,
+		Position: 379,
+	}, got)
+}