feat(提升性能): 减少无效粗体检查，提升文字渲染性能

ofdgo_font_match.go

@@ -318,8 +318,11 @@ func fontDefaultSystemNames() []string {
 func fontNoSyntheticBold(names ...string) bool {
 	for _, name := range names {
 		for _, rule := range fontMatchRules {
+			if !rule.NoSyntheticBold {
+				continue
+			}
 			level := fontRuleMatchLevel(rule, name)
-			if rule.NoSyntheticBold && level >= fontMatchExact && level <= fontMatchPartial {
+			if level >= fontMatchExact && level <= fontMatchPartial {
 				return true
 			}
 		}

ofdgo_renderer_text.go

@@ -139,7 +139,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 	embeddedFont := false
 	if of, ok := r.Reader.fontCache[fontID]; ok {
 		embeddedFont = of.FontFile != ""
-		if !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
+		if syntheticBold && !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
 			syntheticBold = false
 		}
 		if of.Bold {