[feat] Cloud onboarding flow implementation (#5494)

* feature: cloud onboarding scaffolding

* fix: redirect unknown routes

* feature: cloud onboarding flow

* chore: code review

* test: api mock for test failing

* refactor: Centralize onboarding routing with dedicated check views

- Add UserCheckView to handle all user status routing decisions
- Add InviteCheckView to manage invite code validation flow
- Simplify auth.ts by removing async operations and extra complexity
- Update login/signup to always redirect through UserCheckView
- Remove distributed routing logic from all onboarding components
- Simplify router guards to delegate to check views
- Fix infinite redirect loops for non-whitelisted users
- Use window.location.href for final navigation to bypass router conflicts

Breaking changes:
- Removed claimInvite from auth.ts (moved to CloudClaimInviteView)
- Changed route names to use cloud- prefix consistently
- Simplified getMe() to synchronous function

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: delete unused file

* Revert "test: api mock for test failing"

This reverts commit 06ca56c05e.

* feature: API applied

* feature: survey view

* feature: signup / login view completed

* style: min-h-screen deleted

* feature: completed login flow

* feature: router view added

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/platform/onboarding/cloud/CloudVerifyEmailView.vue

@@ -0,0 +1,18 @@
+<!-- eslint-disable @intlify/vue-i18n/no-raw-text -->
+<template>
+  <div>
+    <h1>Email Verification</h1>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted } from 'vue'
+
+// import { verifyEmail } from '@/api/auth'
+import router from '@/router'
+
+onMounted(async () => {
+  // verifyEmail()
+  await router.push({ name: 'cloud-invite-check' })
+})
+</script>