Add onboarding UI tests and improve app data management

- Add Suite0_OnboardingTests with fresh install and login test flows
- Add accessibility identifiers to onboarding views for UI testing
- Remove deprecated DataCache in favor of unified DataManager
- Update API layer to support public upgrade-triggers endpoint
- Improve onboarding first task view with better date handling
- Update various views with accessibility identifiers for testing
- Fix subscription feature comparison view layout
- Update document detail view improvements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

iosApp/iosApp/Contractor/ContractorFormSheet.swift

@@ -12,6 +12,7 @@ struct ContractorFormSheet: View {
     @Environment(\.dismiss) private var dismiss
     @StateObject private var viewModel = ContractorViewModel()
     @StateObject private var residenceViewModel = ResidenceViewModel()
+    @ObservedObject private var dataManager = DataManagerObservable.shared
 
     let contractor: Contractor?
     let onSave: () -> Void
@@ -41,7 +42,7 @@ struct ContractorFormSheet: View {
     @FocusState private var focusedField: ContractorFormField?
 
     private var specialties: [ContractorSpecialty] {
-        return DataCache.shared.contractorSpecialties.value as? [ContractorSpecialty] ?? []
+        return dataManager.contractorSpecialties
     }
 
     private var canSave: Bool {