feat(web): I1 shell and I2 customer/project UI

Vue 3 + Element Plus layout with JWT login, RBAC routes, axios 401
handling with token restore, and Customers/Projects views wired to
platform APIs.

Made-with: Cursor

web/delivery-platform-ui/src/App.vue

@@ -0,0 +1,15 @@
+<template>
+  <router-view />
+</template>
+
+<script setup>
+</script>
+
+<style>
+html,
+body,
+#app {
+  margin: 0;
+  height: 100%;
+}
+</style>