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/012_water_log_display_summary.sql

@@ -1,103 +0,0 @@
--- =============================================================================
--- Water Log V1.6 - Display Summary RPC
--- Returns headgate latest readings + today's aggregates for Smartsheet/display.
--- SECURITY DEFINER so anon key can call it (same as other water log RPCs).
--- =============================================================================
-
-CREATE OR REPLACE FUNCTION public.get_water_display_summary(p_brand_id uuid)
-RETURNS jsonb
-LANGUAGE plpgsql
-SECURITY DEFINER SET search_path = public
-AS $$
-BEGIN
-  RETURN (
-    WITH headgate_data AS (
-      SELECT
-        hg.id,
-        hg.name,
-        COALESCE(hg.unit, 'CFS') as unit,
-        (
-          SELECT jsonb_build_object(
-            'measurement', le.measurement,
-            'user_name', u.name,
-            'logged_at', le.logged_at
-          )
-          FROM public.water_log_entries le
-          JOIN public.water_users u ON u.id = le.user_id
-          WHERE le.headgate_id = hg.id
-          ORDER BY le.logged_at DESC
-          LIMIT 1
-        ) as latest_entry,
-        (
-          SELECT le.logged_at
-          FROM public.water_log_entries le
-          WHERE le.headgate_id = hg.id
-          ORDER BY le.logged_at DESC
-          LIMIT 1
-        ) as last_logged_at,
-        (
-          SELECT FLOOR(EXTRACT(EPOCH FROM (now() - le.logged_at)) / 60)::int
-          FROM public.water_log_entries le
-          WHERE le.headgate_id = hg.id
-          ORDER BY le.logged_at DESC
-          LIMIT 1
-        ) as minutes_ago
-      FROM public.water_headgates hg
-      WHERE hg.brand_id = p_brand_id
-        AND hg.active = true
-        AND hg.deleted_at IS NULL
-    ),
-    today_stats AS (
-      SELECT
-        count(*) as cnt,
-        COALESCE(sum(measurement), 0) as total
-      FROM public.water_log_entries
-      WHERE brand_id = p_brand_id AND logged_at::date = CURRENT_DATE
-    ),
-    entries_ordered AS (
-      SELECT e.logged_at, e.headgate_id, e.user_id, e.measurement, e.unit, e.notes, e.submitted_via
-      FROM public.water_log_entries e
-      WHERE e.brand_id = p_brand_id
-      ORDER BY e.logged_at DESC
-      LIMIT 20
-    ),
-    recent_entries_agg AS (
-      SELECT COALESCE(jsonb_agg(
-        jsonb_build_object(
-          'logged_at', e.logged_at,
-          'headgate_name', hg.name,
-          'user_name', u.name,
-          'user_role', u.role,
-          'measurement', e.measurement,
-          'unit', e.unit,
-          'notes', e.notes,
-          'submitted_via', e.submitted_via
-        )
-      ), '[]'::jsonb) as data
-      FROM entries_ordered e
-      JOIN public.water_headgates hg ON hg.id = e.headgate_id
-      JOIN public.water_users u ON u.id = e.user_id
-    )
-    SELECT jsonb_build_object(
-      'headgates', (
-        SELECT COALESCE(jsonb_agg(
-          jsonb_build_object(
-            'id', hd.id,
-            'name', hd.name,
-            'unit', hd.unit,
-            'latest_entry', hd.latest_entry,
-            'last_logged_at', hd.last_logged_at,
-            'minutes_ago', hd.minutes_ago
-          )
-        ), '[]'::jsonb)
-        FROM headgate_data hd
-      ),
-      'today_count', (SELECT cnt FROM today_stats),
-      'today_total', (SELECT total FROM today_stats),
-      'recent_entries', (SELECT data FROM recent_entries_agg)
-    )
-  );
-END;
-$$;
-
-NOTIFY pgrst, 'reload schema';