feat(09-03): configure Playwright for E2E testing

- Set testDir to './tests/e2e' for E2E tests
- Configure single worker for database safety
- Add desktop and mobile viewports (Desktop Chrome, Pixel 5)
- Enable screenshots on failure, disable video
- Add webServer to auto-build and preview app
- Create separate docker config for deployment tests

package.json

@@ -19,7 +19,7 @@
 		"test:unit:watch": "vitest",
 		"test:coverage": "vitest run --coverage",
 		"test:e2e": "playwright test",
-		"test:e2e:docker": "BASE_URL=http://localhost:3000 playwright test tests/docker-deployment.spec.ts"
+		"test:e2e:docker": "BASE_URL=http://localhost:3000 playwright test --config=playwright.docker.config.ts"
 	},
 	"devDependencies": {
 		"@playwright/test": "^1.58.1",