[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/views/templates/BaseViewTemplate.vue

@@ -7,6 +7,7 @@
         : 'text-neutral-900 bg-neutral-300'
     ]"
   >
+    <slot name="header"></slot>
     <!-- Virtual top menu for native window (drag handle) -->
     <div
       v-show="isNativeWindow()"
@@ -14,10 +15,11 @@
       class="app-drag w-full h-[var(--comfy-topbar-height)]"
     />
     <div
-      class="flex-grow w-full flex items-center justify-center overflow-auto"
+      class="flex-1 flex-grow w-full flex items-center justify-center overflow-auto"
     >
       <slot />
     </div>
+    <slot name="footer"></slot>
   </div>
 </template>