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/Models/AppSettings.swift

@@ -1,11 +1,12 @@
 import Foundation
 import SwiftData
 
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere.
 @Model
 final class AppSettings {
-    var mealWindows: String // "dinnerOnly", "lunchOnly", "both"
+    var mealWindows: String = "dinnerOnly" // legacy: "dinnerOnly", "lunchOnly", "both"
     var includeWeekends: Bool = true
-    var language: String // "spanish", "english"
+    var language: String = "system"
 
     /// Comma-separated MealType raw values, in chronological order (2.0).
     /// nil = derive from the legacy `mealWindows` field (pre-2.0 installs).
@@ -14,12 +15,12 @@ final class AppSettings {
     var calendarId: String?
     var syncEnabled: Bool = false
     var syncMode: String? // "weekComplete", "manual"
-    var lunchTime: Date
-    var dinnerTime: Date
+    var lunchTime: Date = AppSettings.defaultTime(hour: 14)
+    var dinnerTime: Date = AppSettings.defaultTime(hour: 21)
     var breakfastTime: Date? // optional: pre-2.0 stores lack it
     var snackTime: Date?
-    var eventDuration: Int
-    var eventPrefix: String
+    var eventDuration: Int = 60
+    var eventPrefix: String = "🍽️"
     var reminderMinutesBefore: Int?
     var iCloudSyncEnabled: Bool?
     var weekExportStyle: String?

MealMood/Models/Dish.swift

@@ -1,13 +1,14 @@
 import Foundation
 import SwiftData
 
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere.
 @Model
 final class Dish {
-    @Attribute(.unique) var id: UUID
-    var name: String
+    var id: UUID = UUID()
+    var name: String = ""
     var descriptionText: String?
-    var tagIds: [UUID]
-    var createdAt: Date
+    var tagIds: [UUID] = []
+    var createdAt: Date = Date()
     var isPriority: Bool = false
 
     /// Optional ingredient lines (one per entry, e.g. "200g spaghetti").

MealMood/Models/MealSlot.swift

@@ -1,11 +1,12 @@
 import Foundation
 import SwiftData
 
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere.
 @Model
 final class MealSlot {
-    @Attribute(.unique) var id: UUID
-    var dayOfWeek: Int // 0=Monday, 6=Sunday
-    var mealType: String // "lunch", "dinner"
+    var id: UUID = UUID()
+    var dayOfWeek: Int = 0 // 0=Monday, 6=Sunday
+    var mealType: String = MealType.dinner.rawValue
     var dishId: UUID?
     var calendarEventId: String?
     var isRuleOverridden: Bool = false

MealMood/Models/ShoppingItem.swift

@@ -4,15 +4,16 @@ import SwiftData
 /// One line of the weekly shopping list. Items are either derived from a
 /// planned dish's ingredients (`dishId` set) or added free-hand by the user
 /// (`dishId == nil`). Check-off state persists across app launches.
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere.
 @Model
 final class ShoppingItem {
-    @Attribute(.unique) var id: UUID
-    var weekStartDate: Date
-    var title: String
+    var id: UUID = UUID()
+    var weekStartDate: Date = Date()
+    var title: String = ""
     var dishId: UUID?
     var isChecked: Bool = false
     var sortOrder: Int = 0
-    var createdAt: Date
+    var createdAt: Date = Date()
 
     init(
         id: UUID = UUID(),

MealMood/Models/Tag.swift

@@ -1,19 +1,20 @@
 import Foundation
 import SwiftData
 
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere.
 @Model
 final class Tag {
-    @Attribute(.unique) var id: UUID
-    var name: String
-    var nameEN: String
-    var color: String
+    var id: UUID = UUID()
+    var name: String = ""
+    var nameEN: String = ""
+    var color: String = ""
     var maxPerWeek: Int?
     var noConsecutive: Bool = false
     var noDuplicateInDay: Bool = false
     var mealTypeRestriction: String? // "lunch", "dinner", nil
     var dayRestriction: String? // nil = any day, "weekdays" = Mon-Fri, "weekend" = Sat-Sun
     var isDefault: Bool = true
-    var sortOrder: Int
+    var sortOrder: Int = 0
 
     init(
         id: UUID = UUID(),

MealMood/Models/WeekPlan.swift

@@ -1,16 +1,25 @@
 import Foundation
 import SwiftData
 
+// CloudKit-compatible (2.0): no unique constraints, inline defaults everywhere,
+// and the relationship stored as optional (CloudKit requires it). `slots` keeps
+// its name so existing stores lightweight-migrate; use `slotList` in code.
 @Model
 final class WeekPlan {
-    @Attribute(.unique) var id: UUID
-    var weekStartDate: Date
-    var createdAt: Date
-    var updatedAt: Date
+    var id: UUID = UUID()
+    var weekStartDate: Date = Date()
+    var createdAt: Date = Date()
+    var updatedAt: Date = Date()
     var userRating: Int = 0   // 0 = unrated, 1 = liked, -1 = disliked
 
     @Relationship(deleteRule: .cascade)
-    var slots: [MealSlot]
+    var slots: [MealSlot]? = []
+
+    /// Non-optional facade over the CloudKit-required optional relationship.
+    var slotList: [MealSlot] {
+        get { slots ?? [] }
+        set { slots = newValue }
+    }
 
     init(
         id: UUID = UUID(),