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/091_brand_plan_tier.sql

@@ -1,83 +0,0 @@
--- Add plan_tier column to brands
-ALTER TABLE public.brands
-  ADD COLUMN IF NOT EXISTS plan_tier TEXT NOT NULL DEFAULT 'starter'
-  CHECK (plan_tier IN ('starter', 'farm', 'enterprise'));
-
--- Add stripe_customer_id for Stripe billing portal
-ALTER TABLE public.brands
-  ADD COLUMN IF NOT EXISTS stripe_customer_id TEXT;
-
--- Add plan limits columns
-ALTER TABLE public.brands
-  ADD COLUMN IF NOT EXISTS max_users INTEGER DEFAULT 1,
-  ADD COLUMN IF NOT EXISTS max_stops_monthly INTEGER DEFAULT 10,
-  ADD COLUMN IF NOT EXISTS max_products INTEGER DEFAULT 25;
-
--- RPC: update_brand_plan_tier
-CREATE OR REPLACE FUNCTION public.update_brand_plan_tier(
-  p_brand_id      UUID,
-  p_plan_tier     TEXT
-) RETURNS VOID AS $$
-BEGIN
-  IF p_plan_tier NOT IN ('starter', 'farm', 'enterprise') THEN
-    RAISE EXCEPTION 'Invalid plan tier: %', p_plan_tier;
-  END IF;
-  UPDATE brands SET
-    plan_tier = p_plan_tier,
-    updated_at = now()
-  WHERE id = p_brand_id;
-END;
-$$ LANGUAGE plpgsql SECURITY DEFINER;
-
--- RPC: update_brand_stripe_customer_id
-CREATE OR REPLACE FUNCTION public.update_brand_stripe_customer_id(
-  p_brand_id      UUID,
-  p_stripe_customer_id TEXT
-) RETURNS VOID AS $$
-BEGIN
-  UPDATE brands SET
-    stripe_customer_id = p_stripe_customer_id,
-    updated_at = now()
-  WHERE id = p_brand_id;
-END;
-$$ LANGUAGE plpgsql SECURITY DEFINER;
-
--- RPC: get_brand_plan_info (returns plan tier + limits + usage stats)
-CREATE OR REPLACE FUNCTION public.get_brand_plan_info(p_brand_id UUID)
-RETURNS JSONB AS $$
-DECLARE
-  v_result JSONB;
-  v_user_count BIGINT;
-  v_active_stops BIGINT;
-  v_product_count BIGINT;
-  v_brand RECORD;
-BEGIN
-  SELECT plan_tier, max_users, max_stops_monthly, max_products, stripe_customer_id
-  INTO v_brand
-  FROM brands WHERE id = p_brand_id;
-
-  IF v_brand IS NULL THEN
-    RETURN NULL;
-  END IF;
-
-  -- Count current usage
-  SELECT COUNT(*) INTO v_user_count FROM admin_users WHERE brand_id = p_brand_id AND deleted_at IS NULL;
-  SELECT COUNT(*) INTO v_active_stops FROM stops WHERE brand_id = p_brand_id AND active = true AND date >= date_trunc('month', now());
-  SELECT COUNT(*) INTO v_product_count FROM products WHERE brand_id = p_brand_id AND deleted_at IS NULL;
-
-  SELECT jsonb_build_object(
-    'plan_tier', v_brand.plan_tier,
-    'max_users', v_brand.max_users,
-    'max_stops_monthly', v_brand.max_stops_monthly,
-    'max_products', v_brand.max_products,
-    'stripe_customer_id', v_brand.stripe_customer_id,
-    'usage', jsonb_build_object(
-      'users', v_user_count,
-      'stops_this_month', v_active_stops,
-      'products', v_product_count
-    )
-  ) INTO v_result;
-
-  RETURN v_result;
-END;
-$$ LANGUAGE plpgsql SECURITY DEFINER;