refactor(onboarding): restructure onboarding routes and components

- Removed obsolete onboarding routes: complete, create-complex, index, verify-email, and verify.
- Introduced new setup stepper page for onboarding process.
- Created a multi-step setup component to handle complex creation with validation.
- Added new schemas for complex creation and plan features.
- Implemented detailed steps for complex name, location, plan selection, and court setup.
- Enhanced error handling and user feedback during the onboarding process.

apps/frontend/src/lib/api-client.ts

@@ -43,7 +43,6 @@ export class ApiClientError extends Error {
 }
 
 export const apiClient = {
-  onboarding: api.onboarding,
   plans: api.plans,
   user: api.user,
   complexes: api.complexes,