1.1.5: conversion funnel overhaul

Paywall:
- Redesigned PremiumView with yearly/monthly/lifetime side by side
- 7-day free trial badge with savings % vs monthly
- Social proof line, BEST VALUE highlight on yearly
- StoreManager: new yearlyProduct, lifetimeProduct, yearlySavingsPercent, hasTrialAvailable

Funnel:
- Paywall step added to onboarding (PaywallStepView)
- Contextual modal at dish limit (replaces silent block)
- Visible "X/15 dishes" counter in DishListView
- BottomPromoBanner rotates AdMob with internal "Remove ads" CTA (1 in 4)
- Free dish limit lowered 20 → 15
- Review prompt earlier: 2 weeks → 1 week

Analytics:
- paywall_viewed/dismissed with source + seconds_on_screen
- dish_limit_hit, week_limit_hit, free_trial_started events
- Every PremiumView call site now passes its source

StoreKit:
- MealMood.storekit: added yearly $19.99 + 7d trial, monthly trial, lifetime $39.99
- AppStoreConnect-1.1.5-setup.md with full manual setup instructions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

MealMood/ViewModels/OnboardingViewModel.swift

@@ -27,7 +27,7 @@ final class OnboardingViewModel: ObservableObject {
     @Published var addedDishes: [(name: String, tagIds: [UUID])] = []
     let maxOnboardingDishes = 10
 
-    let totalSteps = 5
+    let totalSteps = 6
 
     var canContinue: Bool {
         switch currentStep {
@@ -36,6 +36,7 @@ final class OnboardingViewModel: ObservableObject {
         case 2: return true // Weekends (toggle)
         case 3: return true // Calendar (optional)
         case 4: return true // Dishes are optional
+        case 5: return true // Paywall (always skippable)
         default: return false
         }
     }