fix: renumber migrations 0042-0045 after rebase onto main

Main added 0041_app_settings, so branch migrations shift up by one.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/backend/src/db/migrations/0043_user-pin.sql

@@ -0,0 +1,20 @@
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "pin_hash" varchar(255);
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "employee_number" varchar(20) UNIQUE;
+
+-- Auto-assign employee numbers to existing users
+DO $$ DECLARE r RECORD; num INT := 1001;
+BEGIN
+  FOR r IN (SELECT id FROM "user" WHERE employee_number IS NULL ORDER BY created_at) LOOP
+    UPDATE "user" SET employee_number = num::text WHERE id = r.id;
+    num := num + 1;
+  END LOOP;
+END $$;
+
+-- Seed POS config
+INSERT INTO "app_config" ("key", "value", "description") VALUES
+  ('pos_lock_timeout', '15', 'POS auto-lock timeout in minutes (0 to disable)'),
+  ('receipt_header', '', 'Text shown below logo on receipts'),
+  ('receipt_footer', '', 'Thank you message at bottom of receipt'),
+  ('receipt_return_policy', '', 'Return policy text on receipt (blank to hide)'),
+  ('receipt_social', '', 'Website or social media shown on receipt')
+ON CONFLICT ("key") DO NOTHING;