feat: Stripe subscriptions, tier-based permissions, dark mode, and UX improvements

- Fix Stripe SDK v14 compatibility (bracket notation for subscription items)
- Fix subscription period dates from subscription items instead of subscription object
- Add tier-based permissions (can_accept_payments, etc.) on tenant signup
- Add stripe_customer_id field to Tenant model
- Add clickable logo on login page (navigates to /)
- Add database setup message during signup wizard
- Add dark mode support for payment settings and Connect onboarding
- Add subscription management endpoints (cancel, reactivate)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

smoothschedule/payments/urls.py

@@ -5,6 +5,12 @@ from django.urls import path
 from .views import (
     # Config status
     PaymentConfigStatusView,
+    # Subscription plans & add-ons
+    SubscriptionPlansView,
+    CreateCheckoutSessionView,
+    SubscriptionsView,
+    CancelSubscriptionView,
+    ReactivateSubscriptionView,
     # API Keys (Free Tier)
     ApiKeysView,
     ApiKeysValidateView,
@@ -33,6 +39,13 @@ urlpatterns = [
     # Payment configuration status
     path('config/status/', PaymentConfigStatusView.as_view(), name='payment-config-status'),
 
+    # Subscription plans & add-ons
+    path('plans/', SubscriptionPlansView.as_view(), name='subscription-plans'),
+    path('checkout/', CreateCheckoutSessionView.as_view(), name='create-checkout'),
+    path('subscriptions/', SubscriptionsView.as_view(), name='subscriptions'),
+    path('subscriptions/cancel/', CancelSubscriptionView.as_view(), name='cancel-subscription'),
+    path('subscriptions/reactivate/', ReactivateSubscriptionView.as_view(), name='reactivate-subscription'),
+
     # API Keys endpoints (free tier)
     path('api-keys/', ApiKeysView.as_view(), name='api-keys'),
     path('api-keys/validate/', ApiKeysValidateView.as_view(), name='api-keys-validate'),