Add Stripe webhook endpoint, Supabase analytics rollup, and update env/docs

[feispla]

Motivation

• Add a server-side Stripe webhook endpoint to securely verify incoming Stripe events on Vercel.
• Provide a backend analytics rollup to aggregate store_events and newsletter_signups into daily tables for secure reporting.
• Tighten and document runtime defaults and deployment configuration for Supabase, Stripe, GitHub agent metadata and the app URL.

Description

• Add api/stripe-webhook.js implementing Stripe signature parsing, timestamp freshness checking, HMAC-SHA256 verification with timing-safe comparison, JSON parsing, logging and a POST-only route that returns 200 on verified events.
• Add supabase/migrations/202605150001_analytics_rollup.sql to create analytics_event_cursor, analytics_event_daily, analytics_leads_daily, RLS policies restricting selects to a service_role, and a security definer function process_store_events() that aggregates new rows into the daily rollups.
• Update .env.example with obfuscated keys, new STRIPE_* and APP_URL entries, set SHOPIFY_ENABLE_REMOTE_PRODUCTS=false, and add GitHub agent workflow metadata.
• Update docs/INTEGRATIONS.md with a new Stripe + Vercel webhook setup guide and notes about the analytics rollup migration and RLS behavior.

Testing

• No automated tests were executed as part of this rollout.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
feishtml	Ready	Preview, Comment	May 15, 2026 8:14am

[supabase]

Updates to Preview Branch (codex/configure-stripe-with-vercel-webhook-2e3mmj) ↗︎

Deployments	Status	Updated
Database	✅	Fri, 15 May 2026 08:14:28 UTC
Services	✅	Fri, 15 May 2026 08:14:28 UTC
APIs	✅	Fri, 15 May 2026 08:14:28 UTC

Tasks are run on every commit but only new migration files are pushed.
Close and reopen this PR if you want to apply changes from existing seed or migration files.

Tasks	Status	Updated
Configurations	✅	Fri, 15 May 2026 08:14:29 UTC
Migrations	✅	Fri, 15 May 2026 08:14:29 UTC
Seeding	✅	Fri, 15 May 2026 08:14:29 UTC
Edge Functions	✅	Fri, 15 May 2026 08:14:32 UTC

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