2.0: CloudKit private-database sync replaces KV snapshot sync

Foundation for 2.1 family sharing (CKShare needs these models + container).
SwiftData cannot share across Apple IDs today, so 2.0 ships true multi-device
sync for the same account instead:

- Models made CloudKit-compatible: dropped @Attribute(.unique) on all 5,
  inline defaults on every attribute, WeekPlan.slots stored as optional
  relationship (name preserved → lightweight migration) with non-optional
  slotList facade; ~73 call sites renamed.
- Container: cloudKitDatabase .automatic, falling back to the local-only
  store when CloudKit is unavailable; failures recorded to Crashlytics.
- Entitlements: iCloud CloudKit service (container already existed);
  remote-notification background mode for push-driven sync.
- Legacy KV snapshot sync (ICloudSyncService) stays inert when CloudKit is
  active — kept only for 1.x devices.
- DeduplicationService collapses cross-device duplicates deterministically on
  launch (settings singleton, default tags with tagId remapping, same-week
  plans).
- Note: AppSettings.isPremium now syncs across same-Apple-ID devices; StoreKit
  (PremiumSyncService + Transaction.updates) remains the source of truth and
  reconciles on every launch/foreground.

All 21 unit tests pass, including ICloudSyncPremiumIsolationTests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BkanrydYtrme8wipTzWssG

MealMood/Views/Stats/StatsView.swift

@@ -130,14 +130,14 @@ struct StatsView: View {
     // MARK: - Computed stats
 
     private var plannedWeeks: [WeekPlan] {
-        weekPlans.filter { plan in plan.slots.contains { $0.dishId != nil } }
+        weekPlans.filter { plan in plan.slotList.contains { $0.dishId != nil } }
     }
 
     private var weeksWithAnyDish: Int { plannedWeeks.count }
 
     private var completeWeeks: Int {
         weekPlans.filter { plan in
-            !plan.slots.isEmpty && plan.slots.allSatisfy { $0.dishId != nil || $0.isEatingOut }
+            !plan.slotList.isEmpty && plan.slotList.allSatisfy { $0.dishId != nil || $0.isEatingOut }
         }.count
     }
 
@@ -170,7 +170,7 @@ struct StatsView: View {
     private var dishUsage: [UUID: Int] {
         var counts: [UUID: Int] = [:]
         for plan in weekPlans {
-            for slot in plan.slots {
+            for slot in plan.slotList {
                 if let id = slot.dishId { counts[id, default: 0] += 1 }
             }
         }
@@ -196,7 +196,7 @@ struct StatsView: View {
         let tagMap = Dictionary(uniqueKeysWithValues: allTags.map { ($0.id, $0) })
         var counts: [UUID: Int] = [:]
         for plan in weekPlans {
-            for slot in plan.slots {
+            for slot in plan.slotList {
                 guard let dishId = slot.dishId, let dish = dishMap[dishId] else { continue }
                 for tagId in dish.tagIds { counts[tagId, default: 0] += 1 }
             }