增加页面优化相关API、配置、消息代号

pkg/serverconfigs/http_page_optimization_css.go

@@ -0,0 +1,29 @@
+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package serverconfigs
+
+import "github.com/tdewolff/minify/v2/css"
+
+type HTTPCSSOptimizationConfig struct {
+	IsOn bool `yaml:"isOn" json:"isOn"`
+
+	Precision int  `yaml:"precision" json:"precision"`
+	KeepCSS2  bool `yaml:"keepCSS2" json:"keepCSS2"`
+}
+
+func NewHTTPCSSOptimizationConfig() *HTTPCSSOptimizationConfig {
+	return &HTTPCSSOptimizationConfig{
+		KeepCSS2: true,
+	}
+}
+
+func (this *HTTPCSSOptimizationConfig) Init() error {
+	return nil
+}
+
+func (this *HTTPCSSOptimizationConfig) AsMinifier() *css.Minifier {
+	return &css.Minifier{
+		KeepCSS2:  this.KeepCSS2,
+		Precision: this.Precision,
+	}
+}