2.0: sync CloudKit en tiempo real vía push silencioso

NSPersistentCloudKitContainer solo sincronizaba de forma oportunista (sin
push), por lo que un plato nuevo tardaba mucho o no aparecía en el otro
dispositivo. Se activa el push de CloudKit:

- aps-environment en MealMood.entitlements vía variable APS_ENVIRONMENT
  (development en Debug, production en Release) para no romper TestFlight.
- AppDelegate con registerForRemoteNotifications() + manejo del push
  silencioso; el mirror de SwiftData importa al ser despertado.
- (Capability Push Notifications habilitada en el App ID por API.)

Pendiente: regenerar el provisioning profile AppStore con Push antes de
la build 63, y validar el sync push en iPhone+iPad vía TestFlight.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A3HaWmmtTQ1vdTERtSYU6p

MealMood.xcodeproj/project.pbxproj

@@ -923,6 +923,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = MealMood/Resources/MealMood.entitlements;
+				APS_ENVIRONMENT = production;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CURRENT_PROJECT_VERSION = 62;
 				DEVELOPMENT_TEAM = 2825Q76T7H;
@@ -1028,6 +1029,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = MealMood/Resources/MealMood.entitlements;
+				APS_ENVIRONMENT = development;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CURRENT_PROJECT_VERSION = 62;
 				DEVELOPMENT_TEAM = 2825Q76T7H;