add web api access key

route/install.js

@@ -90,6 +90,9 @@ router
       printer: {
         serial: '',
         feed: 8
+      },
+      api: {
+        secret: ''
       }
     }
 
@@ -101,6 +104,8 @@ router
     json.printer.serial = arr.tty
     json.printer.feed = feed
 
+    json.api.secret = arr.secret || ''
+
     let wconfig = await new Promise((resolve, reject) => {
       fs.writeFile(path.resolve(process.env.PROJECT_ROOT, 'config.json'), JSON.stringify(json, null, 2), {
         mode: 0o664,