feat(web): add zone-based website management

以稳定 Zone ID 替换旧托管域名详情页：列表展示根域与域名计数，详情提供
概览/域名/路由/证书/设置 Tabs，并补齐 ZoneService 与 vitest 行为测试。
Zone 列表 API 返回 domain_count；同步 Swagger 与重构计划进度。

frontend/package.json

@@ -82,13 +82,18 @@
     "@eslint/eslintrc": "^3",
     "@tailwindcss/postcss": "^4",
     "@tailwindcss/typography": "^0.5.19",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "15.5.6",
+    "jsdom": "^29.1.1",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "vitest": "^4.1.10"
   }
 }