fix(label): expand wildcard labels before unmarshaling and add corresponding test

internal/docker/label.go

@@ -1,6 +1,9 @@
 package docker
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
@@ -13,6 +16,8 @@ func ParseLabels(labels map[string]string) (LabelMap, gperr.Error) {
 	nestedMap := make(LabelMap)
 	errs := gperr.NewBuilder("labels error")
 
+	ExpandWildcard(labels)
+
 	for lbl, value := range labels {
 		parts := strutils.SplitRune(lbl, '.')
 		if parts[0] != NSProxy {
@@ -50,3 +55,32 @@ func ParseLabels(labels map[string]string) (LabelMap, gperr.Error) {
 
 	return nestedMap, errs.Error()
 }
+
+func ExpandWildcard(labels map[string]string) {
+	aliasLabels := make([]string, 0, len(labels))
+	wildcardLabels := make(map[string]string)
+
+	for lbl, value := range labels {
+		parts := strings.SplitN(lbl, ".", 3) // Split into proxy, alias, rest
+		if parts[0] != NSProxy || len(parts) < 2 {
+			continue
+		}
+		alias := parts[1] // alias or wildcard alias
+		if alias == WildcardAlias {
+			delete(labels, lbl)
+			if len(parts) < 3 { // invalid wildcard label (no suffix)
+				continue
+			}
+			wildcardLabels[parts[2]] = value
+		} else {
+			// Extract just the alias part (first segment after proxy)
+			aliasLabels = append(aliasLabels, alias)
+		}
+	}
+
+	for lbl, v := range wildcardLabels {
+		for _, alias := range aliasLabels {
+			labels[fmt.Sprintf("%s.%s.%s", NSProxy, alias, lbl)] = v
+		}
+	}
+}