Fix false positives on prompt injection checks: add word boundaries to DAN and STAN

Support ES256 algorithm for new Supabase JWT signing keys

Secure backend JWT verification using Supabase JWKS signature validation

Security fixes: JWT auth, rate limiting, and atomic usage increments

Update to Razorpay Orders checkout

Phase 6 Step 2: Implement Razorpay subscription integration and webhooks

Configure Human-Grade Writing constraints and force enhanced mode

Phase 6 Step 1: Add Supabase Auth, usage limits checking and tracking

Add input sanitization against prompt injection

Add readability and purpose controls to humanizer

Remove detector and evaluator, simplify API

Update CORS for Vercel

Deploy humanizer backend