Optimize subscription tier management and empty state logic

Changes:
- Make currentTier a computed property from StoreKit instead of stored value
- Initialize StoreKit at app launch and refresh on foreground for ready subscription status
- Fix empty state logic: show empty state when limit > 0, upgrade prompt when limit = 0
- Add subscription status display in Profile screen (iOS/Android)
- Add upgrade prompts to Residences and Tasks screens for free tier users
- Improve SubscriptionHelper with better tier checking logic

iOS:
- SubscriptionCache: currentTier now computed from StoreKit.purchasedProductIDs
- StoreKitManager: add refreshSubscriptionStatus() method
- AppDelegate: initialize StoreKit at launch and refresh on app active
- ContractorsListView: use shouldShowUpgradePrompt(currentCount:limitKey:)
- WarrantiesTabContent/DocumentsTabContent: same empty state fix
- ProfileTabView: display current tier and limitations status
- ResidencesListView/ResidenceDetailView: add upgrade prompts for free users
- AllTasksView: add upgrade prompt for free users

Android:
- ContractorsScreen/DocumentsScreen: fix empty state logic
- ProfileScreen: display subscription status and limits
- ResidencesScreen/ResidenceDetailScreen: add upgrade prompts
- UpgradeFeatureScreen: improve UI layout

Shared:
- APILayer: add getSubscriptionStatus() method
- SubscriptionHelper: add hasAccessToFeature() utility
- Remove duplicate subscription checking logic

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

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

iosApp/iosApp/PushNotifications/AppDelegate.swift

@@ -21,6 +21,13 @@ class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDele
             PushNotificationManager.shared.clearBadge()
         }
 
+        // Initialize StoreKit and check for existing subscriptions
+        // This ensures we have the user's subscription status ready before they interact
+        Task {
+            _ = StoreKitManager.shared
+            print("✅ StoreKit initialized at app launch")
+        }
+
         return true
     }
 
@@ -31,6 +38,12 @@ class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDele
         Task { @MainActor in
             PushNotificationManager.shared.clearBadge()
         }
+
+        // Refresh StoreKit subscription status when app comes to foreground
+        // This ensures we have the latest subscription state if it changed while app was in background
+        Task {
+            await StoreKitManager.shared.refreshSubscriptionStatus()
+        }
     }
 
     // MARK: - Remote Notifications