fix(frontend): 移除 openapi-typescript 依赖，解决 TS6 peer 冲突导致服务器 npm install 失败

- openapi-typescript 仅用于本地 gen:api 生成类型，不参与构建，服务器不需要
- gen:api 改用 npx --yes openapi-typescript@7.13.0 按需拉取
- 服务器 npm install 不再需要 --legacy-peer-deps

frontend/package.json

@@ -7,7 +7,7 @@
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
     "preview": "vite preview",
-    "gen:api": "openapi-typescript ../openapi.json -o src/types/api.ts"
+    "gen:api": "npx --yes openapi-typescript@7.13.0 ../openapi.json -o src/types/api.ts"
   },
   "dependencies": {
     "air-datepicker": "^3.6.0",
@@ -22,7 +22,6 @@
     "@types/node": "^24.12.3",
     "@vitejs/plugin-vue": "^6.0.6",
     "@vue/tsconfig": "^0.9.1",
-    "openapi-typescript": "^7.13.0",
     "typescript": "~6.0.2",
     "vite": "^8.0.12",
     "vue-tsc": "^3.2.8"