Added subscription metadata to bills: is_subscription, type, reminder_days, source, detected_at
Backend subscription API (routes/subscriptions.js)
SimpleFIN recommendation logic (services/subscriptionService.js)
New /subscriptions page (client/pages/SubscriptionsPage.jsx)
Track-as-subscription controls in BillModal.jsx
Navigation under Tracker menu
Accepting a recommendation creates a subscription-backed bill + links detected transactions
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