feat: add Flutter mobile clients and staff delivery API

ui/playwright.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from "@playwright/test";
+
+const testPort = Number(process.env.MOBILE_RUNTIME_TEST_PORT ?? 4174);
+
+export default defineConfig({
+  testDir: "./tests",
+  testMatch: "**/*.spec.ts",
+  timeout: 20_000,
+  use: {
+    baseURL: `http://127.0.0.1:${testPort}`,
+    viewport: { width: 1100, height: 1100 },
+  },
+  webServer: {
+    command: `npm run dev -- --port ${testPort}`,
+    url: `http://127.0.0.1:${testPort}/tests/runtime-fixture.html`,
+    reuseExistingServer: process.env.MOBILE_RUNTIME_TEST_PORT == null,
+  },
+});