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Add a new /subscription route showing three VIP membership plans (Monthly, Quarterly, Annual) with a pink→peach banner, per-plan gradient price bars, a benefits card, a mock activate CTA, and an agreement checkbox. - New reusable <Checkbox /> in src/app/_components/core for the legal agreement toggle - Hardcoded SUBSCRIPTION_PLANS constant in src/data/constants - New SubscriptionScreen composed of 7 colocated components (back link, user row, banner, plan card, benefits card, CTA button) with CSS Modules matching the existing design-token system - Route registered as protected and reached from /sidebar "Membership" - Mock CTA: window.alert + router.push(/chat) — no payment calls Co-Authored-By: Claude <noreply@anthropic.com>