feature(cloudcmd) add --prefix

json/bin.json

@@ -9,6 +9,7 @@
     "-c, --config               ": "configuration file path",
     "--editor                   ": "set editor: \"dword\" or \"edward\"",
     "--root                     ": "set root directory",
+    "--prefix                   ": "set url prefix",
     "--port                     ": "set port number",
     "--no-auth                  ": "disable authorization",
     "--no-server                ": "do not start server",

json/config.json

@@ -17,5 +17,6 @@
     "port": 8000,
     "ip": null,
     "root": "/",
+    "prefix": "",
     "progress": true
 }