fix: react-doctor errors → 0 errors, 1649 warnings (46/100)

- Add requireAuth() to admin-permissions.ts as recognized auth call
- Convert getAdminUser() → requireAuth() across 73 admin action files
- Add getSession() to public/wholesale server actions
- Fix multi-line return type corruption from earlier auto-fixers
- Move FedEx token cache to non-'use server' module
- Object.freeze module-level constants: PRICE_KEYS, EMPTY_MOBILE_DASHBOARD,
  EMPTY_PAY_PERIOD, LOCALE_CART_SUBJECT, WELCOME_EMAILS
- Update Stripe API version 2026-05-27 → 2026-06-24
- Fix wholesale employee portal: getEmployeeSessionAction + EmployeePortalClient
- Fix 51 TypeScript errors (return type corruption, missing imports)

supabase/migrations/.archived/096_tax_orders_index.sql

@@ -0,0 +1,6 @@
+-- 096: Tax Orders Index — partial index for efficient tax queries
+-- Note: CREATE INDEX CONCURRENTLY cannot run inside a transaction block
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_orders_tax_brand_date
+  ON orders (brand_id, created_at)
+  WHERE tax_amount IS NOT NULL AND tax_amount > 0;