removed Cypress setup and related dependencies

frontend/package.json

@@ -10,9 +10,6 @@
     "build": "run-p type-check \"build-only {@}\" --",
     "preview": "vite preview",
     "test:unit": "vitest",
-    "prepare": "cypress install",
-    "test:e2e": "start-server-and-test preview http://localhost:4173 'cypress run --e2e'",
-    "test:e2e:dev": "start-server-and-test 'vite dev --port 4173' http://localhost:4173 'cypress open --e2e'",
     "build-only": "vite build",
     "type-check": "vue-tsc --build",
     "lint:oxlint": "oxlint . --fix -D correctness --ignore-path .gitignore",
@@ -37,9 +34,7 @@
     "@vue/eslint-config-typescript": "^14.5.1",
     "@vue/test-utils": "^2.4.6",
     "@vue/tsconfig": "^0.7.0",
-    "cypress": "^14.5.0",
     "eslint": "^9.29.0",
-    "eslint-plugin-cypress": "^5.1.0",
     "eslint-plugin-oxlint": "~1.1.0",
     "eslint-plugin-vue": "~10.2.0",
     "jiti": "^2.4.2",