feat(admin): 提示词控制面页 + 概览/状态页重做 + 接入 vitest

- 新增「提示词」页(/prompts)：接 /api/v1/prompts，建版本/激活热下发/
  对比激活版行级 diff/撤销，挂到配置组
- 概览页重做为系统控制塔：吃 admin/overview(全平台口径)——平台任务/
  评测/用户规模/服务在线 + 模型路由态 + 提示词覆盖态 + 健康拓扑 + 30s自刷
- 服务状态页重做：中性克制风 + 请求链路做成深色实时数据管道(流动光点/
  节点辉光) + MCP 工具改能力域配色小卡片
- 接入 vitest(此前零测试)：41 单测(api 控制面/lib diff/路由派生)
- api.ts 增 statsOverview/adminOverview/prompt 控制面四接口 + groupPrompts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-admin/package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "react": "^19.0.0",
@@ -14,13 +16,18 @@
     "react-router-dom": "^7.1.0"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.0",
+    "autoprefixer": "^10.4.0",
+    "jsdom": "^29.1.1",
+    "postcss": "^8.4.0",
+    "tailwindcss": "^3.4.0",
     "typescript": "^5.6.0",
     "vite": "^5.4.0",
-    "tailwindcss": "^3.4.0",
-    "autoprefixer": "^10.4.0",
-    "postcss": "^8.4.0"
+    "vitest": "^4.1.9"
   }
 }