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>

.env.prod

@@ -0,0 +1,23 @@
+# API Configuration
+API_BASE_URL=
+API_USERNAME=
+API_PASSWORD=
+CASHIER_USERNAME=
+CASHIER_PASSWORD=
+
+# Dashboard Configuration
+DASHBOARD_BASE_URL=
+DASHBOARD_USERNAME=
+DASHBOARD_PASSWORD=
+
+# ADB Configuration (Android Debug Bridge)
+ADB_DEVICE_ID=emulator-5554
+POS_OK_BUTTON_X=579
+POS_OK_BUTTON_Y=1256
+POS_CANCEL_BUTTON_X=400
+POS_CANCEL_BUTTON_Y=1256
+
+# Test Configuration
+TERMINAL_ID=
+MERCHANT_ID=MERCHANT001
+TEST_AMOUNT=100