test(e2e): add Cypress scaffold + CI job

frontend/cypress.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from "cypress";
+
+export default defineConfig({
+  e2e: {
+    baseUrl: "http://localhost:3000",
+    video: false,
+    screenshotOnRunFailure: true,
+    specPattern: "cypress/e2e/**/*.cy.{ts,tsx,js,jsx}",
+    supportFile: "cypress/support/e2e.ts",
+  },
+});