feature: 实现数据库实例管理

server/internal/db/application/application.go

@@ -5,10 +5,15 @@ import (
 )
 
 var (
+	instanceApp  Instance  = newInstanceApp(persistence.GetInstanceRepo())
 	dbApp        Db        = newDbApp(persistence.GetDbRepo(), persistence.GetDbSqlRepo())
 	dbSqlExecApp DbSqlExec = newDbSqlExecApp(persistence.GetDbSqlExecRepo())
 )
 
+func GetInstanceApp() Instance {
+	return instanceApp
+}
+
 func GetDbApp() Db {
 	return dbApp
 }