Modify: use INT represent Database port

pkg/conf/conf.go

@@ -15,7 +15,7 @@ type database struct {
 	Name        string
 	TablePrefix string
 	DBFile      string
-	Port		string
+	Port        int
 }
 
 // system 系统通用配置

pkg/conf/defaults.go

@@ -13,6 +13,7 @@ var RedisConfig = &redis{
 var DatabaseConfig = &database{
 	Type:   "UNSET",
 	DBFile: "cloudreve.db",
+	Port:   3306,
 }
 
 // SystemConfig 系统公用配置