```

feat(database): 新增数据库初始化函数

新增 NewDatabase 函数，支持根据驱动类型初始化 MySQL 或 Postgres 数据库连接。
该函数根据传入的驱动名称自动路由到对应的数据库连接创建逻辑，并提供错误处理。
```

with/etcd.go

@@ -0,0 +1,54 @@
+package with
+
+import (
+	"time"
+
+	"git.apinb.com/bsm-sdk/core/conf"
+	"git.apinb.com/bsm-sdk/core/errcode"
+	"git.apinb.com/bsm-sdk/core/print"
+	"git.apinb.com/bsm-sdk/core/vars"
+	"go.etcd.io/etcd/client/pkg/v3/transport"
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+func Etcd(cfg *conf.EtcdConf, cli *clientv3.Client) {
+	if cfg == nil || len(cfg.Endpoints) == 0 {
+		panic("Etcd endpoints is Empty!")
+	}
+
+	etcdCfg := clientv3.Config{
+		Endpoints:   cfg.Endpoints,
+		DialTimeout: 5 * time.Second,
+	}
+
+	if cfg.Passwd != nil {
+		etcdCfg.Username = cfg.Passwd.Account
+		etcdCfg.Password = cfg.Passwd.Password
+
+	}
+
+	if cfg.TLS != nil {
+		tlsInfo := transport.TLSInfo{
+			TrustedCAFile: cfg.TLS.CaFile,
+			CertFile:      cfg.TLS.CertFile,
+			KeyFile:       cfg.TLS.KeyFile,
+		}
+		tlsConfig, err := tlsInfo.ClientConfig()
+		if err != nil {
+			print.Error(errcode.ErrEtcd.Error())
+			panic(err)
+		}
+		etcdCfg.TLS = tlsConfig
+	}
+
+	var err error
+	cli, err = clientv3.New(etcdCfg)
+	if err != nil {
+		print.Error(errcode.ErrEtcd.Error())
+		panic(err)
+	}
+
+	// print inform.
+	print.Info("[BSM - %s] Service Center: %v", vars.ServiceKey, cfg.Endpoints)
+	return
+}