Deploy on BTP (#793)

minimal changes required to deploy the CAP samples in _shared db_ mode:
- db: all bookshop, orders, reviews CDS models into one db instance (_shared-db_)
- services: bookstore, orders, reviews
- approuter with UI symlinks:
  - Vue: bookshop, reviews
  - Fiori: orders
 - authentification: xsuaa
 - messaging: Event Mesh
 - destinations: orders, reviews
- cds:
  - projection OrdersNoDraft for backend direct access
  - event OrderChanged
- deployment: mta.yml

app-router/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "approuter",
+  "dependencies": {
+    "@sap/approuter": "^17.0.0"
+  },
+  "engines": {
+    "node": "^20"
+  },
+  "scripts": {
+    "start": "node node_modules/@sap/approuter/approuter.js"
+  }
+}