first commit

Playwright API test suite for payment/cashier endpoints, with
per-environment config (dev/staging/prod) loaded via dotenv.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,6 @@
+node_modules/
+playwright-report/
+test-results/
+dist/
+*.log
+.DS_Store