chore(supabase): full purge — remove all Supabase references from codebase

- Delete supabase/ directory (config.toml, push-migrations.js,
  ADMIN_CREATE_STOP_FIX.sql, 137 archived migration files)
- Remove @supabase/ssr and @supabase/supabase-js from package.json
- Strip *.supabase.co from next.config.ts image hostnames
- Strip https://*.supabase.co from vercel.json CSP connect-src
- Remove 'supabase/**' ignore from eslint.config.mjs
- Clean supabase references from src/lib/db.ts, vitest.config.ts,
  db/seeds/2026-tuxedo-tour-stops.sql, src/actions/storefront.ts,
  scripts/import-tuxedo-stops.ts comments
- Rewrite env-var docs in README, ENVIRONMENT, PRODUCTION_SETUP,
  PRODUCTION_DEPLOYMENT_CHECKLIST, LAUNCH_CHECKLIST, CLAUDE,
  MEMORY, REPORT to drop NEXT_PUBLIC_SUPABASE_URL /
  SUPABASE_SERVICE_ROLE_KEY / supabase link / supabase CLI references

The canonical migration runner is now scripts/migrate.js (uses pg
directly via DATABASE_URL). Migrations live in db/migrations/. The
Supabase CLI is no longer in the codebase. The only remaining
'@supabase/*' in the dep tree is @supabase/auth-js as a transitive
of @neondatabase/auth (Neon Auth / Better Auth).

Final source scan: grep -rln '@supabase\|rest/v1\|supabase\.co'
src/ tests/ db/ scripts/ next.config.ts vercel.json eslint.config.mjs
package.json returns zero. Verification: npm install clean
(11 added, 21 removed, 12 changed), tsc shows same 17 pre-existing
errors (Stripe dahlia API version + fetch preconnect mocks),
vitest 172/175 (3 pre-existing failures in getAdminUser.test.ts),
lint shows same 14 pre-existing errors. Live-tested: dev server
boots in 248ms, public storefronts (/) (/login) (/pricing) (/tuxedo)
(/indian-river-direct) all return 200; /admin/v2?demo=1 reaches 200
after dev_session redirect; storefront renders real brand content.

supabase/migrations/.archived/092_stripe_subscriptions.sql

@@ -1,74 +0,0 @@
--- Migration 092: Stripe Subscriptions + Billing Integration
--- Enables real Stripe subscription management for platform billing
-
--- ── Subscription tracking columns on brands ────────────────────────────────
-ALTER TABLE brands ADD COLUMN IF NOT EXISTS stripe_subscription_id TEXT;
-ALTER TABLE brands ADD COLUMN IF NOT EXISTS stripe_subscription_status TEXT DEFAULT 'inactive';
-ALTER TABLE brands ADD COLUMN IF NOT EXISTS stripe_current_period_end TIMESTAMPTZ;
-
--- ── RPC: Save subscription data from Stripe webhook ─────────────────────────
-CREATE OR REPLACE FUNCTION set_brand_subscription(
-  p_brand_id UUID,
-  p_subscription_id TEXT,
-  p_status TEXT,
-  p_current_period_end TIMESTAMPTZ
-) RETURNS BOOLEAN AS $$
-BEGIN
-  UPDATE brands SET
-    stripe_subscription_id = p_subscription_id,
-    stripe_subscription_status = p_status,
-    stripe_current_period_end = p_current_period_end,
-    updated_at = NOW()
-  WHERE id = p_brand_id;
-  RETURN TRUE;
-END;
-$$ LANGUAGE plpgsql SECURITY DEFINER;
-
-GRANT EXECUTE ON FUNCTION set_brand_subscription(UUID, TEXT, TEXT, TIMESTAMPTZ) TO authenticated;
-
--- ── RPC: Get subscription info ─────────────────────────────────────────────
-CREATE OR REPLACE FUNCTION get_brand_subscription(p_brand_id UUID)
-RETURNS JSONB AS $$
-DECLARE
-  result JSONB;
-BEGIN
-  SELECT jsonb_build_object(
-    'stripe_subscription_id', stripe_subscription_id,
-    'stripe_subscription_status', stripe_subscription_status,
-    'stripe_current_period_end', stripe_current_period_end,
-    'stripe_customer_id', stripe_customer_id,
-    'plan_tier', plan_tier
-  ) INTO result
-  FROM brands WHERE id = p_brand_id;
-
-  RETURN result;
-END;
-$$ LANGUAGE plpgsql SECURITY DEFINER;
-
-GRANT EXECUTE ON FUNCTION get_brand_subscription(UUID) TO authenticated;
-
--- ── Stripe price IDs (environment-variable-driven) ─────────────────────────
--- These should be set in .env.local:
--- STRIPE_PRICE_STARTER=price_xxxx
--- STRIPE_PRICE_FARM=price_xxxx
--- STRIPE_PRICE_ENTERPRISE=price_xxxx
--- STRIPE_PRICE_HARVEST_REACH=price_xxxx  (add-on)
--- STRIPE_PRICE_WHOLESALE_PORTAL=price_xxxx
--- STRIPE_PRICE_WATER_LOG=price_xxxx
--- STRIPE_PRICE_AI_TOOLS=price_xxxx
--- STRIPE_PRICE_SQUARE_SYNC=price_xxxx
--- STRIPE_PRICE_SMS_CAMPAIGNS=price_xxxx
-
--- ── Feature flag auto-enable map ───────────────────────────────────────────
--- When Stripe subscription is active for a given price, the corresponding
--- brand_features flag is enabled. When subscription is canceled, it's disabled.
---
--- Price ID → feature key mapping (configured via env vars):
--- STRIPE_PRICE_HARVEST_REACH  → harvest_reach
--- STRIPE_PRICE_WHOLESALE_PORTAL → wholesale_portal
--- STRIPE_PRICE_WATER_LOG     → water_log
--- STRIPE_PRICE_AI_TOOLS      → ai_tools
--- STRIPE_PRICE_SQUARE_SYNC   → square_sync
--- STRIPE_PRICE_SMS_CAMPAIGNS → sms_campaigns
---
--- Plan tier changes are handled separately via plan upgrade checkout sessions.