[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/components/dialog/content/signin/SignUpForm.vue

@@ -44,7 +44,7 @@
       >
         {{ t('auth.signup.personalDataConsentLabel') }}
       </label>
-      <small v-if="$field.error" class="text-red-500 -mt-4">{{
+      <small v-if="$field.error" class="text-red-500 mt-4">{{
         $field.error.message
       }}</small>
     </FormField>
@@ -58,7 +58,7 @@
     <Button
       type="submit"
       :label="t('auth.signup.signUpButton')"
-      class="h-10 font-medium mt-4"
+      class="h-10 font-medium mt-4 text-white"
     />
   </Form>
 </template>