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/bookshop

@@ -0,0 +1 @@
+../bookshop/app/vue

app-router/orders

@@ -0,0 +1 @@
+../orders/app/orders

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"
+  }
+}

app-router/reviews

@@ -0,0 +1 @@
+../reviews/app/vue

app-router/xs-app.json

@@ -0,0 +1,52 @@
+{
+  "welcomeFile": "app/bookshop/index.html",
+  "routes": [
+    {
+      "source": "^/app/(.*)$",
+      "target": "$1",
+      "localDir": ".",
+      "cacheControl": "no-cache, no-store, must-revalidate"
+    },
+    {
+      "source": "^/appconfig/",
+      "localDir": ".",
+      "cacheControl": "no-cache, no-store, must-revalidate"
+    },
+    {
+      "source": "^/admin/(.*)$",
+      "target": "/admin/$1",
+      "destination": "bookstore-api",
+      "csrfProtection": true
+    },
+    {
+      "source": "^/browse/(.*)$",
+      "target": "/browse/$1",
+      "destination": "bookstore-api",
+      "csrfProtection": true
+    },
+    {
+      "source": "^/user/(.*)$",
+      "target": "/user/$1",
+      "destination": "bookstore-api",
+      "csrfProtection": true
+    },
+    {
+      "source": "^/odata/v4/orders/(.*)$",
+      "target": "/odata/v4/orders/$1",
+      "destination": "orders-api",
+      "csrfProtection": true
+    },
+    {
+      "source": "^/reviews/(.*)$",
+      "target": "/reviews/$1",
+      "destination": "reviews-api",
+      "csrfProtection": true
+    },
+    {
+      "source": "^(.*)$",
+      "target": "$1",
+      "localDir": ".",
+      "cacheControl": "no-cache, no-store, must-revalidate"
+    }
+  ]
+}