init: hgmj server initial commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

common/utils.go

@@ -0,0 +1,19 @@
+package common
+
+import "strings"
+
+// JoinUrlPath 域名与uri拼接
+func JoinUrlPath(host string, uri string) (urlpath string) {
+	if uri == "" {
+		return
+	}
+	switch {
+	case strings.HasSuffix(host, "/") && strings.HasPrefix(uri, "/"):
+		urlpath = host[0:len(host)-1] + uri
+	case !strings.HasSuffix(host, "/") && !strings.HasPrefix(uri, "/"):
+		urlpath = host + "/" + uri
+	default:
+		urlpath = host + uri
+	}
+	return
+}