feat: improve cross-uni app workflow

frontend/app/config/default.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "./config.schema.json",
+  "appName": "Open StApps",
+  "appDisplayName": "StApps",
+  "backendUrl": "http://localhost:3000",
+  "backendVersion": "3.0.0",
+  "appLinkHost": "localhost:3000",
+  "appUrlScheme": "de.anyschool.app",
+  "appMarketingVersion": "1.0.0",
+  "android": {
+    "packageName": "de.anyschool.app"
+  }
+}