[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/InviteCheckView.vue

@@ -0,0 +1,33 @@
+<template>
+  <div />
+</template>
+
+<script setup lang="ts">
+import { nextTick, onMounted } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+import { getInviteCodeStatus } from '@/api/auth'
+
+const router = useRouter()
+const route = useRoute()
+
+onMounted(async () => {
+  await nextTick()
+
+  const inviteCode = route.query.inviteCode as string
+  const inviteCodeStatus = await getInviteCodeStatus(inviteCode)
+
+  // TODO: should be deleted when api is ready
+  // if (!status.emailVerified) {
+  //   await router.push({ name: 'cloud-verify-email' })
+  //   return
+  // }
+
+  if (inviteCodeStatus.expired) {
+    await router.push({ name: 'cloud-sorry-contact-support' })
+    return
+  }
+
+  await router.push({ name: 'cloud-claim-invite' })
+})
+</script>