[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/UserCheckView.vue

@@ -0,0 +1,49 @@
+<template>
+  <div />
+</template>
+
+<script setup lang="ts">
+import { nextTick, onMounted, ref } from 'vue'
+import { useRouter } from 'vue-router'
+
+import { getSurveyCompletedStatus, getUserCloudStatus } from '@/api/auth'
+
+const router = useRouter()
+const isNavigating = ref(false)
+
+onMounted(async () => {
+  // Prevent multiple executions
+  if (isNavigating.value) {
+    return
+  }
+  isNavigating.value = true
+
+  // Wait for next tick to ensure component is fully mounted
+  await nextTick()
+
+  const cloudUserStats = await getUserCloudStatus()
+  const surveyStatus = await getSurveyCompletedStatus()
+
+  try {
+    if (!cloudUserStats) {
+      await router.replace({ name: 'cloud-login' })
+      return
+    }
+
+    // Check onboarding status and redirect accordingly
+    if (!surveyStatus) {
+      // User hasn't completed survey
+      await router.replace({ name: 'cloud-survey' })
+    } else if (cloudUserStats.status !== 'active') {
+      // User completed survey but not whitelisted
+      await router.replace({ name: 'cloud-waitlist' })
+    } else {
+      // User is fully onboarded - just reload the page to bypass router issues
+      window.location.href = '/'
+    }
+  } catch (error) {
+    // On error, fallback to page reload
+    await router.push({ name: 'cloud-login' })
+  }
+})
+</script>