Fix: 7-day session config, plan gating on scanner (10 free/month), file upload button, upgrade modal when limit hit

Replace Stripe with Razorpay: subscriptions, webhooks, checkout modal, INR pricing

v3: All missing features — auth callback, settings, PDF export, email (Resend), JWT auth, /api/history, SaulLM integration, extension icons, Supabase 0.10 breaking changes, Stripe v22

v2: Fix all versions + minimal UI redesign (no gradients, clean layout)

🛡️ ClauseGuard v1.0 — Full codebase: Extension + Website + API + ML