feat: PostgreSQL driver support

internal/infrastructure/persistence/database/driver.go

@@ -26,8 +26,9 @@ type Driver interface {
 }
 
 var drivers = map[string]Driver{
-	DriverSQLite: sqliteDriver{},
-	DriverMySQL:  mysqlDriver{},
+	DriverSQLite:   sqliteDriver{},
+	DriverMySQL:    mysqlDriver{},
+	DriverPostgres: postgresDriver{},
 }
 
 type Connection struct {