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/Views/Onboarding/OnboardingView.swift

@@ -63,13 +63,19 @@ struct OnboardingView: View {
                         viewModel: viewModel,
                         tags: tags,
                         onFinish: {
-                            if viewModel.completeOnboarding(context: context) {
-                                onComplete()
-                            }
+                            _ = viewModel.completeOnboarding(context: context)
+                            viewModel.nextStep()
                         }
                     )
                     .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
                     .tag(4)
+
+                    PaywallStepView(
+                        onSkip: { onComplete() },
+                        onConverted: { onComplete() }
+                    )
+                    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
+                    .tag(5)
                 }
                 .tabViewStyle(.page(indexDisplayMode: .never))
                 .animation(.easeInOut(duration: 0.3), value: viewModel.currentStep)