feat: create standalone native fnOS repository

app-src/internal/traffic/endpoint.go

@@ -0,0 +1,17 @@
+package traffic
+
+import (
+	"fmt"
+	"strings"
+)
+
+func EndpointKey(host string, port int) string {
+	host = strings.ToLower(strings.TrimSpace(host))
+	if i := strings.Index(host, ":"); i > 0 {
+		host = host[:i]
+	}
+	if port <= 0 {
+		return host
+	}
+	return fmt.Sprintf("%s:%d", host, port)
+}