[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/scripts/api.ts

@@ -455,7 +455,13 @@ export class ComfyApi extends EventTarget {
     } else {
       options.headers['Comfy-User'] = this.user
     }
-    return fetch(this.apiURL(route), options)
+
+    // If we're on a /cloud route, ensure API calls still go to the root API endpoint
+    const apiUrl = window.location.pathname.startsWith('/cloud')
+      ? `/api${route}`
+      : this.apiURL(route)
+
+    return fetch(apiUrl, options)
   }
 
   override addEventListener<TEvent extends keyof ApiEvents>(